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Etymology
From.

Noun

 * 1) foursome
 * 2) four (name of the number)
 * 3) B (grade)

Etymology
From.

Noun

 * 1) four (digit or figure)
 * 2) anything numbered four (playing card, tram, bus, player with a jersey number 4 etc.)
 * 3) the school grade '4'