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 A and
A and  QJ92. 
Behind him, declarer held
QJ92. 
Behind him, declarer held  Q and
Q and  AK108 so he
made eleven tricks for a top board.  If East had stopped and
REMEMBERED THE BIDDING and COUNTED declarer's points, he would have
realized that West could not hold more than one high honor card. 
Also, the fact that declarer did not run clubs right away was a clue as
to what was about to happen.  Just hold the East hand for a moment
and try to imagine what you are going to discard on the run of the club
suit and you can more easily see the problem.  After winning the
diamond king, East should have also cashed the ace of diamonds before
returning a heart to his partner's ace.  Just holding North-South
to ten tricks would have resulted in an average score.
AK108 so he
made eleven tricks for a top board.  If East had stopped and
REMEMBERED THE BIDDING and COUNTED declarer's points, he would have
realized that West could not hold more than one high honor card. 
Also, the fact that declarer did not run clubs right away was a clue as
to what was about to happen.  Just hold the East hand for a moment
and try to imagine what you are going to discard on the run of the club
suit and you can more easily see the problem.  After winning the
diamond king, East should have also cashed the ace of diamonds before
returning a heart to his partner's ace.  Just holding North-South
to ten tricks would have resulted in an average score.