2/1 may refer to: February 1 (month-day date notation) January 2 (day-month date notation) 2nd Battalion, 1st Marines 2/1 game forcing, bidding system in Bridge
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2/1 may refer to: February 1 (month-day date notation) January 2 (day-month date notation) 2nd Battalion, 1st Marines 2/1 game forcing, bidding system in Bridge