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% time perl prisoners-orig.pl
== SIMULATION 9900 of 10000 ==
Success:   3085
Fail:      6915
Fail rate: 69.15%
perl prisoners-orig.pl  13.09s user 0.01s system 99% cpu 13.101 total

% time perl prisoners.pl     
== SIMULATION 9900 of 10000 ==
Success:   3175
Fail:      6825
Fail rate: 68.25%
perl prisoners.pl  0.71s user 0.00s system 99% cpu 0.716 total

--- prisoners-orig.pl    2025-04-30 17:24:41.190188166 -0400
+++ prisoners.pl    2025-04-30 17:24:01.156228637 -0400
@@ -7,7 +7,7 @@
...
     return \@boxes;
 }