Deal 22	♠ A J 10 8 2 ♥ A 10 8 2 ♦ Q 2 ♣ K 5		WEST   NORTH   EAST   SOUTH 1♠ pass 2♦ pass 2♥ pass 3♣ pass 3NT pass pass pass North opens 1♠. South responds 2♦, a 2/1 force to game. North's priority is to now show the 4-card ♥ suit. Remember that South might also have 4 ♥s. South doesn't have 4 ♥s, nor does she have 3 ♠s. Furthermore, she does not have stoppers in ♣s so she cannot bid NT. Since she has to keep bidding, but has no reasonable bid she can make, she bids the fourth suit, 3♣. Compare this Deal with Deal 21. North understands that South's ♣ bid is Fourth-Suit-Forcing, and does not actually show ♣s. However since North does have a ♣ stopper he bids 3NT. In this case this turns out to be the best game contract.  Deal 23
	♠ 7 4 ♥ K Q 3 ♦ A K J 7 3 ♣ 10 9 7