Example of a Triple
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Triple: Three Squares in the same Row, Column, or Box that together contain just three different Possibles.

In this example, the Triple is the three Squares containing the Possibles 5, 6 and 8 (coloured yellow). These three Squares MUST contain 5, 6 or 8. Therefore 5, 6 and 8 cannot be in any other Square in the same Box. The 6 and 8 (two occurances) outlined in orange are impossible solutions and can be removed.