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Bitsy Perlman

@bitsyperlman.bsky.social
858 followers 292 following 1.5K posts

Economic Historian at the Census. 19th & 21st C innovation, sci of sci, urban/spatial, info spread. All views are my own or expressed for rhetorical exposition. Posts before 2025 were imported. (they/them) Brookline, MA

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Bitsy Perlman @bitsyperlman.bsky.social · 24/09/2026
Public and private funding also do different things: private funders want to appropriate the created intellectual property, whereas public funders want to create public IP alexxihe.github.io/qje.pdf (Also it is very clear that researchers can't replace the funds when they lose public funding)
alexxihe.github.io
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Rachel Leah Childers @donskerclass.bsky.social · 17h
Derenoncourt has done pioneering work on the distributional effects of policies on wealth doi.org/10.1093/qje/... and wages doi.org/10.1093/qje/... combining detailed micro data, historical context, and effective application of theory, inspiring all of us who work on economic heterogeneity. Brava!
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John Cawley @johncawley.bsky.social · 17h
As of 2026-09-27, the # of total jobs listed on JOE is up 5.5% from this point last year. However, last year was a tough one, so for other comparisons this year's job listings are down 27.4% from 2024, and down 32.9% from 2023. 2/9
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Anna Gifty @itsafronomics.blacksky.app · 29/09/2026
I believe that Dr. Ellora Derenoncourt is the first Black woman economist EVER to be named a MacArthur Genius. My heart is bursting. I am OVERJOYED.
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Mike Schneider @mikeysid.bsky.social · 29/09/2026
Missouri drops lawsuit after Trump administration proposes cutting unauthorized immigrants from 2030 census figures: countofcounting.substack.com/p/missouri-d...
countofcounting.substack.com
Missouri drops lawsuit after Trump administration unveils proposal to cut unauthorized immigrants from the 2030 census numbers
To no one’s surprise, Missouri has dropped its lawsuit against the U.S.
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Erika McEntarfer @erikamcentarfer.bsky.social · 29/09/2026
“AI is identifying more billable conditions, not sicker patients“ interesting article on AI cost pressure in health care
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Ben Zipperer @benzipperer.org · 29/09/2026
Huge congrats to the brilliant economist and historian Ellora Derenoncourt, one of this year's MacArthur Fellows!
Ellora Derenoncourt - 2026 MacArthur Fellow
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Sam @samd.bsky.social · 29/09/2026
it is quite confusing that “inclusionary zoning” is not the opposite of “exclusionary zoning”, but actually functions as a tool of exclusionary zoning
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Jake Grumbach @jakemgrumbach.bsky.social · 29/09/2026
Shoutout to the 🐐GOAT🐐, respect greatness www.macfound.org/videos/2026-...
macfound.org
Ellora Derenoncourt - 2026 MacArthur Fellow
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CNBC @cnbc.com · 20h
Inside Man: How Chinese spies used lies, love and betrayal to target the Federal Reserve
cnb.cx
Inside Man: How Chinese spies used lies, love and betrayal to target the Federal Reserve
A CNBC investigation shows how former Fed advisor John Rogers became entangled with a man U.S. officials identify as a Chinese intelligence operative.
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Jeremy Berg @jeremymberg.bsky.social · 18h
It's World Dense Breast Day densebreast-info.org/join-us-for-... If you are interested in this important topic for yourself or your loved ones, follow @drwendieberg.bsky.social and @densebreastinfo.bsky.social for the best vetted information.
densebreast-info.org
Join Us for the 5th Anniversary of World Dense Breast Day, Sept 30, 2026 | DenseBreast-info, Inc.
World Dense Breast Day is just around the corner! On September 30, we will proudly celebrate the 5th anniversary of this remarkable global educational event. As the Official Sponsor of World Dense Bre...
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Evan Roberts @evanrobertsnz.bsky.social · 28/09/2026
Just to put things in perspective, the US has a significantly higher pedestrian death rate from traffic accidents than most OECD countries have from homicides (most OECD countries are around 1/100,000 for homicide) www.cdc.gov/mmwr/volumes...
FIGURE 1. Pedestrian death rates,* by country — United States and 27 other high-income countries, 2013–2022
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Don Moynihan @donmoyn.bsky.social · 28/09/2026
New, from me: Once memory-holed, DOGE is now the subject of revisionism. To better understand why DOGE failed, I talked to people in the civic tech movement that DOGE displaced, who continue to offer the alternative model for how to modernize govt. 🧵 donmoynihan.substack.com/p/doge-vs-ci...
donmoynihan.substack.com
DOGE vs. Civic Tech
As DOGE revisionism picks up, a contrast with the civic tech movement it displaced illuminates its failure
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Bitsy Perlman @bitsyperlman.bsky.social · 27/09/2026
A thought: what if we just had fewer positions that were filled by the president's administration? There is no reason that most of these things couldn't be done by career civil servants (e.g., head of the Census, BLS, BEA have all been, in my experience, better when done by a career civil servant)
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Jacob Edenhofer @jacobedenhofer.bsky.social · 27/09/2026
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Dani Sandler @dismalscientist86.bsky.social · 26/09/2026
AI doing things the humans didn't mean for them to do is not good in general, but the Census part (at least based on the text of the article) sounds like it used an API key to fetch public use data. Which seems ... fine. Maybe even exactly why the data exists in that format.
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Bitsy Perlman @bitsyperlman.bsky.social · 24/09/2026
Public and private funding also do different things: private funders want to appropriate the created intellectual property, whereas public funders want to create public IP alexxihe.github.io/qje.pdf (Also it is very clear that researchers can't replace the funds when they lose public funding)
alexxihe.github.io
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anil oza @aniloza.bsky.social · 24/09/2026
Confirming the White House’s planned EO to exert more political control on NIH seems to be “dead” www.statnews.com/2026/09/23/n...
statnews.com
White House plan to increase control of NIH grants appears 'dead'
A planned EO that would have greatly enhanced White House influence over grants at the NIH is “looking dead,” a source said.
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Hansi Lo Wang (he/him) @hansilowang.bsky.social · 24/09/2026
My latest @npr.org story: Democratic Sen. @warren.senate.gov is demanding that Trump officials explain why the Census Bureau’s parent agency removed a ban on political interference from its scientific integrity policy, as NPR first reported last month www.npr.org/2026/09/24/n...
npr.org
Warren demands Trump officials explain removing a ban on interference in census data
Democratic Sen. Elizabeth Warren asked Trump officials to explain why the Census Bureau's parent agency cut a ban on political interference from its scientific integrity policy, as NPR first reported.
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Carl Quintanilla @carlquintanilla.bsky.social · 22/09/2026
“.. The greatest danger facing society isn’t that software will awaken and overthrow its human masters. It is that we will allow the creators of the software to abdicate human responsibility for the systems they choose to build ..” @wsj.com www.wsj.com/opinion/the-...
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Sarah Jacobson @sarahjacobson.bsky.social · 22/09/2026
Jr economists attending ASSA 2027! Are you interested in a mentoring opportunity w/ leaders in the field? Are you from a group historically underrepresented in econ? Apply for @aeacsmgep.bsky.social small-group breakfast featuring AEA Pres Katherine Abraham Jan 5 8am! www.aeaweb.org/about-aea/co...
aeaweb.org
Small Group Breakfast Meeting for Underrepresented Scholars
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jon ben-menachem @jbenmenachem.com · 22/09/2026
Surprised to see the actual word slop used
Pedro Sant'Anna • • 3rd+
+ Follow
Associate Professor at Emory Universit...
5h・
Lately, I have been thinking a lot about the use of Al in economics, econometrics, and causal inference research, and I must say that, right now, 1 am starting to get tired of it, concerned about how many people use it and how lazy it can make us feel! I can't lose the joy of doing the work | love, so here I am, raising some alarm!
For some context, I have been using these tools a lot in the last year or so. Early on, I got super excited, saw its transformative power, wrote a guide about how I used it, and have also given workshops about my workflow. All this in Spring 2026.
Now, as more and more people use these tools, l am starting to see severe consequences of it:
- I am constantly getting Al-written papers to referee.
The writing is so bad and so obvious that it wasn't meant for humans, and I can't be positive about the paper! If authors don't do their work and put effort into the paper, why should anyone evaluating it do it?! The burden must be on the authors!!!- I am seeing Al doing a lot of sloppy work involving data analysis. Subsetting the data, redefining variables, dropping covariates, forgetting to use weights, and more. This happens when I try to replicate published papers and use my own package to see whether the results change. As I know many of these papers, I can catch the errors, but only if I am really alert. Most people that I talk to are NOT alert!
- Al constantly gives you a sense of certainty that I can't even explain, let alone justify. In the topics that I work on (read, DiD), it keeps telling me stuff that I strongly disagree! If I don't have the subject-specific knowledge to be critical and push back, Al-slop gets into the way of everything!
There are many other concerning things that I keep seeing that I won't get into here, but I feel I need to say all these things as a way to SCREAM:
AI IS A TOOL!
IT REQUIRES SKILLS!
THERE ARE NO SHORTCUTS, SO DON'T BE LAZY!
AI WON'T REPLACE GOOD SCIENCE!
My advice: go do an Al detox from time to time to actually build skills!! Spend the entire week doing things the "old way"! You will see how much more grounded you can become!
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Kristian G. Andersen @kgandersen.bsky.social · 20/09/2026
"White House Moves to Take Control of N.I.H. Grants" [everybody up in arms, as they should be, but for those who have been paying close attention, this has pretty much already happened - the realization just hasn't sunk in yet] www.nytimes.com/2026/09/20/s...
nytimes.com
White House Moves to Take Control of N.I.H. Grants (Gift Article)
Federal officials are drafting an executive order that would place grants under review by an outside panel, the latest effort to redirect billions of dollars in research spending.
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Don Moynihan @donmoyn.bsky.social · 21/09/2026
New from Lauren Supplee at Can We Still Govern? The US government had gradually become better at producing and using evidence. This evidence-based infrastructure is largely invisible, important, and one more thing gutted by Trump. donmoynihan.substack.com/p/the-system...
donmoynihan.substack.com
The System for Using Evidence to Improve Federal Programs Has Been Gutted
Here’s How We Fix It
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Bitsy Perlman @bitsyperlman.bsky.social · 18/09/2026
The quote at the end really clinches this not being an intellectual project. The world is vast and multi-faceted, and so is intellectual rigorous exploration of it. To look at it as “You have two perspectives... exposed to both sides of the argument" is to boil things down to team 1 and team 2
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Carl T. Bergstrom @carlbergstrom.com · 16/09/2026
Short thread: 18 months ago, as part of their assault on higher ed, Trump/DOGE/Vought terminated my friend Kelton Minor's NIH Director's award that would have allowed him to take a faculty position there. Without the funds, Columbia ultimately rescinded the position. Kelton moved to Denmark.
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Michael D. Green, PhD @michaeldgreen.phd · 17/09/2026
Honestly, it was scary to think about being named. As I sat with the opportunity more, I thought that there aren’t a ton of moments to act and set up a better future for science. We’ve all been through a lot. Even though I’m at a vulnerable stage of my career, I also have relative privilege…
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Melissa Gentry @melissadgentry.bsky.social · 16/09/2026
Are you a disability researcher working in the FSRDC wondering where the 1980s disability variable in the CPS went? I've written a CES Technical Note describing my process of bringing in those missing data! ideas.repec.org/p/cen/tnotes...
ideas.repec.org
Recovering Work-Limiting Disability Variables in the 1980s C
Disability status has been elicited systematically in United States surveys as far back as the 1970s and was included in the March Supplement of the Current Population Survey starting in 1981. Unfortu
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Michael Wiebe @michaelwiebe.bsky.social · 17/09/2026
New literature review on housing ladder spillovers: When rich tech workers move in, low-end rents go up. So does it follow that adding high-end homes would reduce them? Yes. Changes at the top of the ladder can propagate down and affect prices at the bottom. 1/
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Peter Nencka 📊 @peternka.bsky.social · 17/09/2026
🚨 Announcing OpenCensus, a new project with @ezrakarger.bsky.social : We are transcribing the historical US censuses and releasing them as open data 2.6 million people so far in 1940, browse here: opencensus.us
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Kathryn Tewson @kathryntewson.bsky.social · 17/09/2026
these quotes are the DEFENDANTS, describing THEIR OWN CONDUCT as “an astonishing theft of unprecedented proportions” and the “largest theft of labor in human history” as well as describing their products as “largely substitutive, period” and “will get more and more substitutive as they get better.”
This case is about, as Microsoft’s Director of Applied Science put it, “an astonishing theft
of unprecedented proportions”; SF1437, perhaps the “largest theft of labor in human history.”
SF1652. Defendants repeatedly copied millions of Plaintiffs’ copyrighted articles in their entirety
without permission to produce substitutive commercial AI products. OpenAI’s Head of ChatGPT
wrote that “[p]ublishers” face an “existential threat” from those products, SF1466, which, he said,
“are largely substitutive, period” and “will get more and more substitutive as they get better.”
SF1473-74. Such admissions eviscerate Defendants’ “fair use” defense because substitution is
“copyright’s bête noire.” Andy Warhol Foundation for the Visual Arts, Inc. v. Goldsmith, 598 U.S.
508, 528 (2023). For Defendants to prevail on this defense “would,” the same Microsoft executive
recognized, arguably “make a complete mockery of the idea of ‘fair use.’” SF1450.
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Jed Kolko @jedkolko.bsky.social · 17/09/2026
Political encroachment in statistical methods for political goals undermines confidence in the entire statistical system. That could hurt funding, response rates, and retention of expert staff, further degrading data quality. Read more at @piie.com www.piie.com/blogs/realti...
piie.com
Political meddling at the Census Bureau damages the entire US statistical system
This summer marks the worst period for US statistical integrity since President Donald Trump fired the head of the Bureau of Labor Statistics last August. Two different and seemingly uncoordinated eve...
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Jason Ukman @jasonukman.bsky.social · 17/09/2026
Deep red bar to the right helps tell the story of the FDA under the Trump administration. Story by @margaretmanto.bsky.social, chart by @jaspar.bsky.social. www.statnews.com/2026/09/17/f...
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Vittoria Elliott @telliotter.bsky.social · 15/09/2026
SCOOP: A group of staffers from the right-wing think tank, America First Policy Initiative, have been detailed to the Census Bureau, where they have access to sensitive data +contributed to a public report that bolsters conspiracy theories undermining trust in elections www.wired.com/story/a-trum...
wired.com
The Census Bureau Is Overrun With Staffers From a MAGA Think Tank
The US Census is home to vast troves of sensitive data on nearly every person living in the country, which is used for apportioning and drawing congressional districts as well as allocating federal fu...
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Scott Imberman @imbernomics.bsky.social · 15/09/2026
Very good. This will be a disaster if it goes through. Unfortunately, a lot of damage is being done by the uncertainty the potential for this rule creates.
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Don Moynihan @donmoyn.bsky.social · 13/09/2026
A recurrent theme in this excellent story about China’s progress is that people there regard Trump as essential to their success, including his ability to drive scientific talent from the US www.newyorker.com/magazine/202...
In Beijing, a think tank at Renmin University recently published an assessment titled
"Thank Trump," which wryly hailed his efforts to hasten the "twilight of an empire," by undermining America's alliances, civil service, scientific institutions, and democratic credibility. In the past two years, the international approval rating of the U.S. has dropped nearly forty points, according to a worldwide survey by the Alliance of Democracies; in multiple polls, China now rates higher than the U.S.
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Dan Vergano @danvergano.bsky.social · 11/09/2026
Science Agencies Pull ‘Political Interference’ Protections From Scientific Integrity Policies www.aip.org/fyi/science-... NSF and the Department of Commerce have scrubbed references to the dangers of political interference in science from official agency policy documents.
aip.org
Science Agencies Pull ‘Political Interference’ Protections From Scientific Integrity Policies
NSF and the Department of Commerce have scrubbed references to the dangers of political interference in science from official agency policy documents.
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Bitsy Perlman @bitsyperlman.bsky.social · 11/09/2026
That night I went to vigial and hoped with eveything I could that this thing didn't pull us into war. Of course I was stunded, I felt so many things, but as time has passed, this stands outs: hoping that we wouldn't make it worse, that it wouldn't be a reason for more violence and death
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Spectrum News NY1 @spectrumnewsny1.bsky.social · 11/09/2026
The last speaker at the 9/11 remembrance ceremony lost his father to the attacks.
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Bitsy Perlman @bitsyperlman.bsky.social · 11/09/2026
That night I went to vigial and hoped with eveything I could that this thing didn't pull us into war. Of course I was stunded, I felt so many things, but as time has passed, this stands outs: hoping that we wouldn't make it worse, that it wouldn't be a reason for more violence and death
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Michael Derby @michaelsderby.bsky.social · 11/09/2026
Bin Laden attacked us in a way that would cause us to overreact. It worked: The Iraq debacle, a super charged security state, the militarization of police, the destruction of trust, all of which leads to our current moment. This nation could have made different choices. 5/5
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Dan Garisto @dangaristo.bsky.social · 10/09/2026
Scoop: This afternoon NSF will formally announce its four 'Frontier Initiatives', and a suite of other changes in a public letter. These Frontier Initiatives (left) are identical to OSTP's 'Grand Research Challenges' that we have been reporting on (right). www.nature.com/articles/d41...
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David Zipper @davidzipper.bsky.social · 10/09/2026
New study finds the social cost of driving a car 1 km—including pollution, crashes, infrastructure, and noise—is more than *triple* the private cost paid by the car owner. doi.org/10.1016/j.tr...
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Mike Schneider @mikeysid.bsky.social · 10/09/2026
Millions wouldn’t be counted and race & ethnicity data wouldn’t be gathered in 2030 census under proposed rule change countofcounting.substack.com/p/proposed-r...
countofcounting.substack.com
Millions wouldn’t be counted and race & ethnicity data wouldn’t be gathered in 2030 census under proposed rule change
The speculation is over.
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The Washington Sun @washingtonsun.bsky.social · 09/09/2026
For the first time, the federal government wants to stop collecting race and ethnicity information about Americans as part of the nation’s census.
washingtonsun.com
Trump Wants the Census to Stop Collecting Race and Ethnicity Data
The administration wants to stop collecting data widely seen as fundamental to public policy, scientific study, market research and more.
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BeijingPalmer @beijingpalmer.bsky.social · 10/09/2026
real friendships involve the other person pushing back against you, having needs, being busy, not being able to devote themselves to you. we know from the experience of the powerful that having somebody at your literal beck and call is a factor in driving people mad.
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Don Moynihan @donmoyn.bsky.social · 09/09/2026
Two examples of politicization today: 1/ Political appointees putting out reports under the Census banner that is bunk. There is a reason the authors won't stand behind their work. Any serious data researcher would be embarrassed. Creates doubts both about the election and the integrity of Census.
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Hansi Lo Wang (he/him) @hansilowang.bsky.social · 09/09/2026
BREAKING: Trump admin proposes major #2030Census changes that would reshape voting maps, including no race & ethnicity questions and excluding non-U.S. citizens without a green card from a count that 14th Amendment says must include “whole number of persons in each state” www.npr.org/2026/09/09/n...
npr.org
Trump officials propose sweeping changes to the census that would reshape voting maps
A Trump census proposal would stop asking about race and exclude millions of U.S. residents from a count that the 14th Amendment says must include the "whole number of persons in each state."
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Dan Garisto @dangaristo.bsky.social · 09/09/2026
Grantmaking has leveled off, so it looks like NSF will make around 6,200 new grants—down from an average of ~11,000. That's a historic low, not seen since the 1980s, when NSF was a far smaller organization. Left was our projection three weeks ago, right is the current data.
Previous plot of NSF new grants projected FY26 would be ~6100Current data for total new grants at NSF
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Danielle Graves Williamson @daniellecgw.bsky.social · 08/09/2026
@ppcreanza.bsky.social, @joaotampellini.bsky.social and I are excited to announce the first iteration of the Junior Economic History Conference, an outlet for early-career researchers to get in-depth feedback on projects: jreconhist.org/flyer/
jreconhist.org
Junior Economic History Conference 2027
Junior Economic History Conference
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