A leap year starting on Friday is any year with 366 days (i.e. it includes 29 February) that begins on Friday 1 January and ends on Saturday 31 December. Examples include 1904, 1932, 1960, 1988, 2016, 2044, and 2072 in the Gregorian Calendar which is used in most of the world. That uses the dominical letter CB, and it is there.
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