Boxception by youz(Dingledooper)

puts$<.map{|n|a=[" "]
eval'a=[b=?++?-*a.size+?+,*a.map{|e|?|+e+?|},b]
'*n.to_i}

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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