74. A player cannot be compelled to play a card which would oblige him to revoke.
75. The call of an exposed card may be repeated until such card has been played.
LEADS OUT OF TURN
76. If either of the declarer's adversaries lead out of turn the declarer may either treat the card so led as an exposed card or may call a suit as soon as it is the turn of either adversary to lead.
77. If the declarer lead out of turn, either from his own hand or from dummy, he incurs no penalty; but he may not rectify the error after the second hand has played.
78. If any player lead out of turn and the three others follow, the trick is complete and the error cannot be rectified; but if only the second, or second and third play to the false lead, their cards may be taken back; there is no penalty against any except the original offender, who, if he be one of the declarer's adversaries, may be penalized as provided in Law 76.
79. If a player called on to lead a suit has none of it, the penalty is paid.
CARDS PLAYED IN ERROR
80. Should the fourth hand, not being dummy or declarer, play before the second, the latter may be called upon to play his highest or lowest card of the suit played, or to win or lose the trick.
81. If any one, not being dummy, omit playing to a trick and such error is not corrected until he has played to the next, the adversaries or either of them may claim a new deal; should either decide that the deal is to stand, the surplus card at the end of the hand is considered to have been played to the imperfect trick, but does not constitute a revoke therein.