Cheryl's birthday: Difference between revisions

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[14, "July"], [16, "July"], [14, "August"], [15, "August"], [17, "August"]]
uniqueday(parr) = filter(x -> sumcount(y -> y[1] == x[1], parr) == 1, parr)
# At the start, they come to know that they have no unique day of month to identify.
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