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perl -le'$==0,(1x$_)=~/(^)(|1(?2)(?2)(?(?{})))$(?{$=++})^/,print$=for +0..13'
perl -le'$==0,(1x$_)=~/^(|()1(?1)(?1)\2)$(?{$=++})^/,print$=for 0..13'
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