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For set A B C, you can enumerate the powerset in binary: ... 0001 D 0000
(for ABC) ... Have we seen C before? YES - return 2 Have we seen D before? No? D == slot 3
By using a dead bit for A, we actually have this: ... 0001 D 0000
11111111111111111111111111 invalid ... 00000000000000000000000010 invalid 00000000000000000000000001 valid (z)
From up above, set (z) ... 0001 D (0001 & 0010 == 0) 0000 () (0000 & 0010 == 0)
use strict; ... print "TOTAL CALLS $calls\n";
#!/usr/bin/perl ... @skippers{@future_skippers} = (1) x @future_skippers; }
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