Fourth Suit Forcing - 8
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Dealer is W     None Vulnerable
West *
♠ -
♥ A J 9 4
♦ K Q 8 6 3

♣ K J 5 2
Next
East
♠ A J 10 9 6
♥ 10 5
♦ A 5 2

♣ A 9 3
 
W N E S
1♦ - 1♠ -
2♣ - 2♥* -
3♥# - 3NT -
Pass -    
 
* = 4th suit forcing
# = Genuine 4-card suit.
Having bid and ♣ before, East knows that West is unbalanced