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  1. f=->s{s[-3]>?!&&f[" "+s.gsub(/^( *\/).|.(.)$|./){$1||$2||($&>?/??/:?\\)}]
  2. puts s}
  3.  
  4. f[STDIN.read.chomp]
Success #stdin #stdout 0.02s 9664KB
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stdin
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//\/\/\\
stdout
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   /\
  //\\
 //\/\\
//\/\/\\
https://ideone.com/HN0l0Y
language:
Ruby (ruby 2.5.5)
created:
7 years ago
visibility:
secret

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