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use strict;
use warnings;
...
}

END { $dbc->disconnect; $dba->disconnect };

#run 1
Benchmark: timing 10 iterations of ac, mc...
...
Benchmark: timing 10 iterations of ac, mc...
 ac: 38 wallclock secs ( 0.48 usr +  0.60 sys =  1.08 CPU) @  9.26/s (
+n=10)
 mc:  4 wallclock secs ( 0.38 usr +  0.40 sys =  0.78 CPU) @ 12.82/s (
+n=10)