Deal 4
 
 
 
♠ 8 5
J 10
8 3
♣ A K 8 7 6 4 3
 
 WEST  NORTH  EAST  SOUTH
1NT
pass3NTpasspass
pass

South is to play 3NT. West leads the 5, East plays the 2.

Make a Plan, then click NEXT .
   
  ♠ A K 7 2
A 8 3
A 9 6 4
♣ 9 2
 

 
Deal 4
 
   3NT
OL: 5
♠ 8 5
J
8 3
♣ A K 8 7 6 4 3
  South is to play 3NT. West leads the 5, East plays the 2.

Winners:   ♠ = 2    = 2    = 1   ♣ = 2   Total = 7

You are very lucky. Apparently West led from K Q so you won an undeserved trick. Now, if ♣s split 2-2 you can make 12 tricks!
But hold it a minute. If you play dummy's two top ♣s and they DON'T split 2-2 you will only win two ♣ tricks and the contract will fail.
Instead you should play a small ♣ from dummy right now. The defenders will win the trick easily, but you will win their return and you will still have a ♣ to get to dummy's 6 ♣ winners!

 NEXT for the complete Deal.
   
  ♠ A K 7 2
A 8
A 9 6 4
♣ 9 2
 

 
Deal 4
 
   3NT
OL: 5
♠ 8 5
J 10
8 3
♣ A K 8 7 6 4 3
  Ducking a ♣ is the only way to make the contract and you might as well do it at the second trick.

 Deal 5 
♠ J 4
K Q 9 5 4
J 9 3
♣ Q 10 5
♠ Q 10 9 6 3
7 6 2
K Q 10 5
♣ J
  ♠ A K 7 2
A 8 3
A 9 6 4
♣ 9 2