Four women -- April, Bella, Cara, and Denise -- and three men -- Edwin, Frank, and Gary -- play bridge, a card game for four players.
- The men and women consist of three married couples and a widow.
- The members of each married couple are never partners in a bridge game.
- No more than one married couple ever plays in the same bridge game.
One night they played four bridge games in which the partners were as follows:
April and Edwin versus Bella and Frank
April and Gary versus Denise and Frank
Bella and Cara versus Frank and Gary
Cara and Edwin versus Denise and Gary
Who is the widow?