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  1. or download this
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3}|($^.{5}){2}$^|$^.{7}$^.{7}$^|^.(...$^){3}/smx|$.>8
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  2. or download this
    $"='ox'x5,$_="1 2 3\n4 5 6\n7 8 9 ";{$^=chop$";print"
$_$^ =>";{<>=~/^(\d)$/i&&s/$1/$^/m or$.--&&redo}/^($^
.){3}|($^.{5}){2}$^|$^.{7}$^.{7}$^|^.(...$^){3}/smx|8
<$. or redo}y/0-9/-/;print