From http://www.mcn.net/~jimloy/reviewc.html#def
DEFINITIONS OF TERMS
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Definitions
Auction:
* hints Suggests a bid. yes/no.
* takeback Undo bid. yes/no.
conventions Significant optional conventions.
rebid Restart bidding. yes/no.
explain bids yes/no.
systems A list of bidding systems.
Abbreviations: SA = Standa
