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Benchmark: timing 10000 iterations of ZZamboni, chromatic...
  ZZamboni: 12 wallclock secs ( 5.64 usr +  0.00 sys =  5.64 CPU)
 chromatic: 19 wallclock secs ( 8.10 usr +  0.01 sys =  8.11 CPU)

#!/usr/bin/perl -w
   use strict;
...
        'ZZamboni' => sub { ZZamboni(\%hash, 0) },
        'chromatic' => sub { chromatic(\%hash) },
        });