#4 Both Vulnerable
East   South   West  North
 2♥        ???
 
South
♠ A 7 6 5 4
♥ A Q 5 4
♦ A K 5
♣ K
 
As South, you have a problem after East opens 2♥. A 2NT overcall shows 15-18 HCP and a balanced/semi-balanced shape. Other choices are 2♠, 3NT, or double. You have the count to overcall 3NT, but the distribution is backwards. Perhaps trading spades for clubs would make 3NT the right bid.
 
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