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In some senses, doubleton is marked as rare. Watch for register when choosing this word.
doubleton
noun 2
Definitions
noun
1
A set containing precisely two elements.
2
A pair of cards of the same suit, which are the only cards of that suit in a player's hand
If she had had the doubleton ace of diamonds and a low club, she would have made a four-club splinter bid, showing four-card spade support, the values for game and a singleton or void in clubs.
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