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#!/usr/bin/perl -w
use strict;
...
s,t,l,m,z,a,s
c,b,a,m,u,t,n
k,l,t,s,z,r,t

perl seediff.pl
Benchmark: timing 50000 iterations of Damn Slow, Much Better...
 Damn Slow:  6 wallclock secs ( 6.12 usr +  0.00 sys =  6.12 CPU) @ 81
+72.61/s (n=50000)
Much Better:  3 wallclock secs ( 2.96 usr +  0.00 sys =  2.96 CPU) @ 1
+6874.79/s (n=50000)