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From Simplex

PRINCIPLE 24: Apart from the use of double, Simplex never keys its bids off the opponents' bidding. (There is, for example, no concept of a jump overcall relative to an opponent's bid. A bid of the 'enemy suit' is always natural, showing at least three cards in that suit.) The philosophy of Simplex is that each hand is worth a particular bid, or sequence of bids, and if one of those bids cannot be made because of opposition bidding, the appropriate bid is usually to double.