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  • \$\begingroup\$ Can you run this input through for me: [5][3] (should return either 4 or 8). \$\endgroup\$ Commented Aug 7, 2013 at 2:14
  • \$\begingroup\$ 9 - but then you seem to have changed the rules. \$\endgroup\$ Commented Aug 7, 2013 at 7:22
  • \$\begingroup\$ Also, why only 4 or 8? \$\endgroup\$ Commented Aug 7, 2013 at 7:41
  • \$\begingroup\$ Oh wait, never mind, I was wrong. Anything except for 7 should work, so 9 is acceptable. \$\endgroup\$ Commented Aug 7, 2013 at 11:51
  • \$\begingroup\$ Also, I didn't mean to change the rules; it's just that I'd phrased them wrong the first time around. \$\endgroup\$ Commented Aug 7, 2013 at 11:51