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  1. or download this
    use v5.20;

while (<DATA>)
...
x12x..x
x123x...x
x123x.x.x
  2. or download this
    xxx => '' x ''
x.x.x => '.' x '.'
x12x..x => '12' x '..'
x123x...x => '123' x '...'
x123x.x.x => '123' x '.x.'