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Step 01 | by srkuban
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Step 01

From the start, we see that Alan & Beth are celebrating Valentine's Day together. This means that nobody else is celebrating with Alan, and nobody else is celebrating with Beth (since each individual is in only one relationship). Thus, we put X in the rest of Alan's and Beth's columns.

 

Whenever we successfully match a couple, we will need to do this for all remaining boxes in the matched row and column.

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Taken on February 5, 2013