| 3(b) The only forbidden pairs are 14, 33, and 41. The square B has addess 241, so must be empty as a consequence of the empty address 41. The square C has address 433, so must be empty as a consequence of the empty address 33. The square A has address 322. It is not empty as a consequence of the forbidden pairs, so if it empty, the IFS is not determined by forbidden pairs. |
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