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k a April Highlights and 2025 AoPS Online Class Information
jlacosta   0
Apr 2, 2025
Spring is in full swing and summer is right around the corner, what are your plans? At AoPS Online our schedule has new classes starting now through July, so be sure to keep your skills sharp and be prepared for the Fall school year! Check out the schedule of upcoming classes below.

WOOT early bird pricing is in effect, don’t miss out! If you took MathWOOT Level 2 last year, no worries, it is all new problems this year! Our Worldwide Online Olympiad Training program is for high school level competitors. AoPS designed these courses to help our top students get the deep focus they need to succeed in their specific competition goals. Check out the details at this link for all our WOOT programs in math, computer science, chemistry, and physics.

Looking for summer camps in math and language arts? Be sure to check out the video-based summer camps offered at the Virtual Campus that are 2- to 4-weeks in duration. There are middle and high school competition math camps as well as Math Beasts camps that review key topics coupled with fun explorations covering areas such as graph theory (Math Beasts Camp 6), cryptography (Math Beasts Camp 7-8), and topology (Math Beasts Camp 8-9)!

Be sure to mark your calendars for the following events:
[list][*]April 3rd (Webinar), 4pm PT/7:00pm ET, Learning with AoPS: Perspectives from a Parent, Math Camp Instructor, and University Professor
[*]April 8th (Math Jam), 4:30pm PT/7:30pm ET, 2025 MATHCOUNTS State Discussion
April 9th (Webinar), 4:00pm PT/7:00pm ET, Learn about Video-based Summer Camps at the Virtual Campus
[*]April 10th (Math Jam), 4:30pm PT/7:30pm ET, 2025 MathILy and MathILy-Er Math Jam: Multibackwards Numbers
[*]April 22nd (Webinar), 4:00pm PT/7:00pm ET, Competitive Programming at AoPS (USACO).[/list]
Our full course list for upcoming classes is below:
All classes run 7:30pm-8:45pm ET/4:30pm - 5:45pm PT unless otherwise noted.

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0 replies
jlacosta
Apr 2, 2025
0 replies
J
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k i Adding contests to the Contest Collections
dcouchman   1
N Apr 5, 2023 by v_Enhance
Want to help AoPS remain a valuable Olympiad resource? Help us add contests to AoPS's Contest Collections.

Find instructions and a list of contests to add here: https://artofproblemsolving.com/community/c40244h1064480_contests_to_add
1 reply
dcouchman
Sep 9, 2019
v_Enhance
Apr 5, 2023
J
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k i Zero tolerance
ZetaX   49
N May 4, 2019 by NoDealsHere
Source: Use your common sense! (enough is enough)
Some users don't want to learn, some other simply ignore advises.
But please follow the following guideline:


To make it short: ALWAYS USE YOUR COMMON SENSE IF POSTING!
If you don't have common sense, don't post.


More specifically:

For new threads:


a) Good, meaningful title:
The title has to say what the problem is about in best way possible.
If that title occured already, it's definitely bad. And contest names aren't good either.
That's in fact a requirement for being able to search old problems.

Examples:
Bad titles:
- "Hard"/"Medium"/"Easy" (if you find it so cool how hard/easy it is, tell it in the post and use a title that tells us the problem)
- "Number Theory" (hey guy, guess why this forum's named that way¿ and is it the only such problem on earth¿)
- "Fibonacci" (there are millions of Fibonacci problems out there, all posted and named the same...)
- "Chinese TST 2003" (does this say anything about the problem¿)
Good titles:
- "On divisors of a³+2b³+4c³-6abc"
- "Number of solutions to x²+y²=6z²"
- "Fibonacci numbers are never squares"


b) Use search function:
Before posting a "new" problem spend at least two, better five, minutes to look if this problem was posted before. If it was, don't repost it. If you have anything important to say on topic, post it in one of the older threads.
If the thread is locked cause of this, use search function.

Update (by Amir Hossein). The best way to search for two keywords in AoPS is to input
[code]+"first keyword" +"second keyword"[/code]
so that any post containing both strings "first word" and "second form".


c) Good problem statement:
Some recent really bad post was:
[quote]$lim_{n\to 1}^{+\infty}\frac{1}{n}-lnn$[/quote]
It contains no question and no answer.
If you do this, too, you are on the best way to get your thread deleted. Write everything clearly, define where your variables come from (and define the "natural" numbers if used). Additionally read your post at least twice before submitting. After you sent it, read it again and use the Edit-Button if necessary to correct errors.


For answers to already existing threads:


d) Of any interest and with content:
Don't post things that are more trivial than completely obvious. For example, if the question is to solve $x^{3}+y^{3}=z^{3}$, do not answer with "$x=y=z=0$ is a solution" only. Either you post any kind of proof or at least something unexpected (like "$x=1337, y=481, z=42$ is the smallest solution). Someone that does not see that $x=y=z=0$ is a solution of the above without your post is completely wrong here, this is an IMO-level forum.
Similar, posting "I have solved this problem" but not posting anything else is not welcome; it even looks that you just want to show off what a genius you are.

e) Well written and checked answers:
Like c) for new threads, check your solutions at least twice for mistakes. And after sending, read it again and use the Edit-Button if necessary to correct errors.



To repeat it: ALWAYS USE YOUR COMMON SENSE IF POSTING!


Everything definitely out of range of common sense will be locked or deleted (exept for new users having less than about 42 posts, they are newbies and need/get some time to learn).

The above rules will be applied from next monday (5. march of 2007).
Feel free to discuss on this here.
49 replies
ZetaX
Feb 27, 2007
NoDealsHere
May 4, 2019
J
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D1025 : Can you do that?
Dattier   2
N 19 minutes ago by CerealCipher
Source: les dattes à Dattier
Let $x_{n+1}=x_n^3$ and $x_0=3$.

Can you calculate $\sum\limits_{i=1}^{2^{2025}} x_i \mod 10^{30}$?
2 replies
Dattier
Yesterday at 8:24 PM
CerealCipher
19 minutes ago
J
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Simple inequality
sqing   7
N 24 minutes ago by sqing
Source: Daniel Sitaru
Let $a,b,c>0$ . Prove that$$\frac{a^3}{b^3}+\frac{b^3}{c^3}+\frac{c^3}{a^3}+9>\frac{3}{2}\left(\frac{a^2}{b^2}+\frac{b^2}{c^2}+\frac{c^2}{a^2}+ \frac{a}{b}+\frac{b}{c}+\frac{c}{a}\right)$$
7 replies
2 viewing
sqing
Feb 10, 2017
sqing
24 minutes ago
J
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Vector Vortex
steven_zhang123   1
N 25 minutes ago by Mathzeus1024
Source: NS Issue 1 P3 (2014.4)
Let $v_{1}, v_{2}, \cdots, v_{n}$ be $n$ unit vectors on a plane, where $n$ is an odd number. Prove that there exist $\varepsilon _i\in \left \{ -1,1 \right \} $ for $i=1,2,\cdots,n$ such that $\left | \sum_{i=1}^{n} \varepsilon_i v_i \right | \le 1.$
1 reply
1 viewing
steven_zhang123
Feb 15, 2025
Mathzeus1024
25 minutes ago
J
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China Northern MO 2009 p4 CNMO
parkjungmin   0
25 minutes ago
Source: China Northern MO 2009 p4 CNMO P4
The problem is too difficult.
0 replies
parkjungmin
25 minutes ago
0 replies
J
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The Appetizer of Iran NT2023
alinazarboland   6
N 38 minutes ago by A22-
Source: Iran MO 3rd round 2023 NT exam , P1
Find all integers $n > 4$ st for every two subsets $A,B$ of $\{0,1,....,n-1\}$ , there exists a polynomial $f$ with integer coefficients st either $f(A) = B$ or $f(B) = A$ where the equations are considered mod n.
We say two subsets are equal mod n if they produce the same set of reminders mod n. and the set $f(X)$ is the set of reminders of $f(x)$ where $x \in X$ mod n.
6 replies
alinazarboland
Aug 17, 2023
A22-
38 minutes ago
J
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Do not try to case bash lol
ItzsleepyXD   1
N 39 minutes ago by Haris1
Source: Own , Mock Thailand Mathematic Olympiad P3
Let $n,d\geqslant 6$ be a positive integer such that $d\mid 6^{n!}+1$ .
Prove that $d>2n+6$ .
1 reply
ItzsleepyXD
an hour ago
Haris1
39 minutes ago
J
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Rutthee on some APMO style
ItzsleepyXD   0
40 minutes ago
Source: Own , Mock Thailand Mathematic Olympiad P10 (Not Rutthee problem , Idk what to name a sequence)
Let $a_0,a_1,\dots$ be Rutthee sequence if $a_0$ be a positive integer and
$$a_{i}\in\left\{3a_{i-1}+2,\frac{2a_{i-1}+1}{a_{i-1}+2},\frac{a_{i-1}}{2a_{i-1}+3}\right\}$$for all $i \in \mathbb{Z^+}$ and there are some positive integer $n$ sastisfied $a_n\in\{2025,2568\}$
Is it possible that there are Rutthee sequence such that there exist positive integer $m\neq n$ such that $a_m=2025$ and $a_n=2568$ also find all possible value of $a_0$ in Rutthee sequence
0 replies
ItzsleepyXD
40 minutes ago
0 replies
J
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3 var inequality
sqing   0
an hour ago
Source: Own
Let $ a,b,c>0 ,\frac{a}{b} +\frac{b}{c} +\frac{c}{a} \leq 2\left( \frac{1}{a}+\frac{1}{b}+\frac{1}{c}\right). $ Prove that
$$a+b+c+2\geq abc$$Let $ a,b,c>0 , a^3+b^3+c^3\leq 2(ab+bc+ca). $ Prove that
$$a+b+c+2\geq abc$$
0 replies
sqing
an hour ago
0 replies
J
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Do not try to bash on beautiful geometry
ItzsleepyXD   0
an hour ago
Source: Own , Mock Thailand Mathematic Olympiad P9
Let $ABC$be triangle with point $D,E$ and $F$ on $BC,AB,CA$
such that $BE=CF$ and $E,F$ are on the same side of $BC$
Let $M$ be midpoint of segment $BC$ and $N$ be midpoint of segment $EF$
Let $G$ be intersection of $BF$ with $CE$ and $\dfrac{BD}{DC}=\dfrac{AC}{AB}$
Prove that $MN\parallel DG$
0 replies
ItzsleepyXD
an hour ago
0 replies
J
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already well-known, but yet strangely difficult
Valentin Vornicu   37
N an hour ago by cursed_tangent1434
Source: Romanian ROM TST 2004, problem 6
Let $a,b$ be two positive integers, such that $ab\neq 1$. Find all the integer values that $f(a,b)$ can take, where \[ f(a,b) = \frac { a^2+ab+b^2} { ab- 1} . \]
37 replies
Valentin Vornicu
May 1, 2004
cursed_tangent1434
an hour ago
J
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Introducing myself at AoPS, and what's your magic wand?
asuth_asuth   1047
N 3 hours ago by RadioDemon666
Hi!

I'm Andrew Sutherland. I'm the new Chief Product Officer at AoPS. As you may have read, Richard is retiring and Ben Kornell and I are working together to lead the company now. I'm leading all the software and digital stuff at AoPS. I just wanted to say hello and introduce myself! I'm really excited to be part of the special community that is AoPS.

Previously, I founded Quizlet as a 15-year-old high school student. I did Course 6 at MIT and then left to lead Quizlet full-time for a total of 14 years. I took a few years off and now I'm doing AoPS! I wrote more about all that on my blog: https://asuth.com/im-joining-aops

I have a question for all of you. If you could wave a magic wand, and change anything about AoPS, what would it be? All suggestions welcome! Thank you.
1047 replies
asuth_asuth
Mar 30, 2025
RadioDemon666
3 hours ago
J
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This has been going on for a while now, can anyone else relate?
jmr2010   2
N Today at 3:02 AM by valisaxieamc
Most of the time when I type in something for the tags or search for a user, the AoPS suggestion box pops up, and most of the time, when I click the suggestion, the box just disappears, meaning the automatic system usually never works
2 replies
jmr2010
Yesterday at 7:16 PM
valisaxieamc
Today at 3:02 AM
J
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Cannot post PHP
char0221   2
N Today at 2:01 AM by bpan2021
Summary of the problem: If I try to post anything with PHP (a coding language), it
Page URL: In any forum or private messages
Steps to reproduce:
1. Create a post.
2. Put some PHP inside, can't give example
Expected behavior: Should post the message
Frequency: 100%
Operating system(s): macOS Sequoia 15.2.1
Browser(s), including version: Safari
Additional information: See attachments
2 replies
char0221
Today at 1:23 AM
bpan2021
Today at 2:01 AM
J
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k How to remove tags from a PM after you've removed yourself from it
Platinum_Dragon   2
N Yesterday at 7:32 PM by Platinum_Dragon
Is it possible? Because it's kind of annoying to have a whole bunch of tags that stick around forever.

thank you
2 replies
Platinum_Dragon
Yesterday at 7:25 PM
Platinum_Dragon
Yesterday at 7:32 PM
J
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J
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Post did not come
Speedysolver1   28
N Apr 16, 2025 by jlacosta
IMAGE
28 replies
Speedysolver1
Apr 14, 2025
jlacosta
Apr 16, 2025
J
Post did not come
G H J
Reveal topic tags
L
G H BBookmark kLocked kLocked NReply
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Speedysolver1
130 posts
Speedysolver1
#1 h  Apr 14, 2025, 3:05 PM • 1 Y
Y by WiseTigerJ1
https://cdn.artofproblemsolving.com/attachments/2/0/d60666a2c67d940c2aef402cc81de37b12b6f7.jpeg
Z K Y
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Speedysolver1
130 posts
Speedysolver1
#2 h  Apr 14, 2025, 3:05 PM • 1 Y
Y by WiseTigerJ1
The post was not there idk why
Z K Y
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Demetri
1329 posts
Demetri
#3 h  Apr 14, 2025, 3:10 PM • 1 Y
Y by WiseTigerJ1
You already posted a thread about this.....
Z K Y
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Speedysolver1
130 posts
Speedysolver1
#4 h  Apr 14, 2025, 3:11 PM • 1 Y
Y by WiseTigerJ1
Demetri wrote:
You already posted a thread about this.....

That is about the time hhere the post did not come
Z K Y
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Demetri
1329 posts
Demetri
#5 h  Apr 14, 2025, 3:15 PM • 1 Y
Y by WiseTigerJ1
Speedysolver1 wrote:
Demetri wrote:
You already posted a thread about this.....

That is about the time hhere the post did not come
Its the same bug, its inconsistent post times.
Z K Y
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Craftybutterfly
410 posts
Craftybutterfly
#6 h  Apr 15, 2025, 5:44 AM
Y by
Reload and it appears
Z K Y
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Speedysolver1
130 posts
Speedysolver1
#7 h  Apr 15, 2025, 11:51 AM
Y by
Craftybutterfly wrote:
Reload and it appears

It didn’t
Z K Y
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k1glaucus
674 posts
k1glaucus
#8 h  Apr 15, 2025, 11:53 AM
Y by
click on another thread and then go back to the one you were on.
Z K Y
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Speedysolver1
130 posts
Speedysolver1
#9 h  Apr 15, 2025, 12:05 PM
Y by
k1glaucus wrote:
click on another thread and then go back to the one you were on.

did not work
Z K Y
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k1glaucus
674 posts
k1glaucus
#10 h  Apr 15, 2025, 12:10 PM
Y by
Did you block them?
Z K Y
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Speedysolver1
130 posts
Speedysolver1
#11 h  Apr 15, 2025, 3:00 PM
Y by
k1glaucus wrote:
Did you block them?

No
Z K Y
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Craftybutterfly
410 posts
Craftybutterfly
#12 h  Apr 15, 2025, 3:12 PM
Y by
Speedysolver1 wrote:
Craftybutterfly wrote:
Reload and it appears

It didn’t

Try opening another tab
Z K Y
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Speedysolver1
130 posts
Speedysolver1
#13 h  Apr 15, 2025, 3:16 PM
Y by
Craftybutterfly wrote:
Speedysolver1 wrote:
Craftybutterfly wrote:
Reload and it appears

It didn’t

Try opening another tab

Did not work
Z K Y
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Solocraftsolo
2555 posts
Solocraftsolo
#14 h  Apr 15, 2025, 3:20 PM
Y by
hard refresh (ctrl+shift+r)
Z K Y
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Speedysolver1
130 posts
Speedysolver1
#15 h  Apr 15, 2025, 3:35 PM
Y by
Solocraftsolo wrote:
hard refresh (ctrl+shift+r)

On a ipad using safari
Z K Y
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Craftybutterfly
410 posts
Craftybutterfly
#16 h  Apr 15, 2025, 4:34 PM
Y by
Restart your device
Z K Y
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Craftybutterfly
410 posts
Craftybutterfly
#18 h  Apr 15, 2025, 4:42 PM
Y by
Then clear cache
Z K Y
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bpan2021
2625 posts
bpan2021
#20 h  Apr 15, 2025, 8:20 PM
Y by
Your issue is due to either the post getting deleted or the post getting posted earlier, and your device not updating. In either case, refreshing makes the issue go away.
Z K Y
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Craftybutterfly
410 posts
Craftybutterfly
#21 h  Apr 15, 2025, 8:32 PM
Y by
bpan2021 wrote:
Your issue is due to either the post getting deleted or the post getting posted earlier, and your device not updating. In either case, refreshing makes the issue go away.

They already tried refreshing
Z K Y
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Demetri
1329 posts
Demetri
#22 h  Apr 15, 2025, 8:39 PM
Y by
bpan2021 wrote:
Your issue is due to either the post getting deleted or the post getting posted earlier, and your device not updating. In either case, refreshing makes the issue go away.
Speedysolver1 wrote:
Craftybutterfly wrote:
Reload and it appears

It didn’t
Z K Y
The post below has been deleted. Click to close.
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b2025tyx
1476 posts
b2025tyx
#23 h  Apr 15, 2025, 8:48 PM
Y by
Try to reload
Z K Y
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jlacosta
635 posts
jlacosta
#25 h  Apr 15, 2025, 9:08 PM
Y by
Can you post the direct link to this thread so that we can look further into it for you?
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Speedysolver1
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Speedysolver1
#26 h  Apr 15, 2025, 10:01 PM
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https://artofproblemsolving.com/community/c2788149h3544183
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bpan2021
2625 posts
bpan2021
#28 h  Apr 15, 2025, 10:11 PM • 1 Y
Y by WiseTigerJ1
Craftybutterfly wrote:
They already tried refreshing

I was previously assuming that the post was deleted, which was why it doesn't appear after refreshing. However, it looks now that the post is indeed there and Speedysolver1 just doesn't see it, so I was incorrect.

I've pinpointed the exact post you're talking about: https://aops.com/community/p34543869. Can you access it?

I'd also recommend restarting your device, and also closing all your tabs and opening them again.
This post has been edited 2 times. Last edited by bpan2021, Apr 15, 2025, 10:12 PM
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Speedysolver1
130 posts
Speedysolver1
#29 h  Apr 15, 2025, 10:51 PM
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bpan2021 wrote:
Craftybutterfly wrote:
They already tried refreshing

I was previously assuming that the post was deleted, which was why it doesn't appear after refreshing. However, it looks now that the post is indeed there and Speedysolver1 just doesn't see it, so I was incorrect.

I've pinpointed the exact post you're talking about: https://aops.com/community/p34543869. Can you access it?

I'd also recommend restarting your device, and also closing all your tabs and opening them again.
No it is not there
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bpan2021
2625 posts
bpan2021
#30 h  Apr 15, 2025, 11:03 PM
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What does it say for you when you click on that link? The post you're telling us about should look as follows:
Attachments:
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Speedysolver1
130 posts
Speedysolver1
#31 h  Apr 16, 2025, 12:59 PM
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It says
Quote:
Rest in peace, Kyren Lacy.
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Craftybutterfly
410 posts
Craftybutterfly
#34 h  Apr 16, 2025, 7:38 PM
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Speedysolver1 wrote:
It says
Quote:
Rest in peace, Kyren Lacy.

I can see the post
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jlacosta
635 posts
jlacosta
#35 h  Apr 16, 2025, 9:11 PM
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Can you provide a screenshot of the post that you see from that specific thread, Speedysolver1? I'm not able ot replicate the issue.

I am able to see that your post didn't go through successfully. Can you make sure that you're posting an image that's within the file size?
This post has been edited 1 time. Last edited by jlacosta, Apr 16, 2025, 9:12 PM
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