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perl -MList::Util="all" -lne "next unless/.../;my(%r,$c);$r{$_}++for(/
+./g);print if all{++$c==$_}sort values %r" linux.words
...

perl -MList::Util="all" -lne "next unless/.{10,}/;my(%r,$c);$r{$_}++fo
+r(/./g);print if all{++$c==$_}sort values %r" linux.words