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2

$\begingroup$ Looks good for all $n\ge 5$ $\endgroup$
– Daniel Mathias
Commented May 20, 2020 at 15:53
1

$\begingroup$ Truly beautiful!! $\endgroup$
– Bernardo Recamán Santos
Commented May 20, 2020 at 16:07
4

$\begingroup$ n = 4 is trivial; fill the grid. n < 4 is trivially impossible. $\endgroup$
– Joshua
Commented May 20, 2020 at 19:30

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► mark spoilers by placing >! at start of line
create code fences with backticks ` or tildes ~
```
like so
```
add language identifier to highlight code
```python
def function(foo):
print(foo)
```
put returns between paragraphs
for linebreak add 2 spaces at end
_italic_ or **bold**
quote by placing > at start of line
to make links (use https whenever possible)
<https://example.com>
[example](https://example.com)
<a href="https://example.com">example</a>
MathJax equations $\sin^2 \theta$

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