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perl -e'$a="(.)"x15000;$_="a"x15000;/$a/;print "$15000\n";' output: a
perl -e'$b=unpack"b*",pack"H*","59dfce2d6b1664d3b26cd9969503";\ for(;$a<length$b;$a+=9){print+pack"b8",substr$b,$a,8;}'