Challenge #241: Friday the 13th

Challenge #241: Friday the 13th

This Friday will be another Friday the 13th. Whether or not you consider yourself to be superstitious, odds are you're familiar with this dreaded calendar configuration.

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But just how common are these occurrences? For this week's challenge, construct a workflow that provides a count of the number of Friday the 13ths for each year since 1900.

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