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Ruby, 53 bytes ->n{n-=3;[?╔+?╦*n+?╗,*[?╠+?╬*n+?╣]*(n+1),?╚+?╩*n+?╝]} Try it online!
Answer
#1: Initial revision
by
snail_
·
2021-08-27T08:40:49Z (over 3 years ago)
# [Ruby], 53 bytes
```ruby
->n{n-=3;[?╔+?╦*n+?╗,*[?╠+?╬*n+?╣]*(n+1),?╚+?╩*n+?╝]}
```
[Try it online!][TIO-ksu3t2ur]
[Ruby]: https://www.ruby-lang.org/
[TIO-ksu3t2ur]: https://tio.run/##KypNqvyfZvtf1y6vOk/X1tg62v7R1CnaQGKZVh6Imq6jBRJaAGKvgQgtjtXSyNM21NQBsmeBBFZCxOfG1v7Ps01PLSnWK8mPz@QqUEjT08jT/G8BAA "Ruby – Try It Online"