Greetings Roy Johnson,
I learn more Perl from reading your code. It took me a while, but somehow overlooked the line sorting $strings before walking through the list.
Today, came to realization that Perl can do bitwise operations on strings.
my ($common) = map length, ($strings[$i1][0] ^ $strings[$i2][0]) =~ /^
+(\0*)/;
Thank you for this.
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