#8 Neither Vulnerable
West   North   East   South
   1♣          1♦       ???
 
North
♠ A K J 3
♥ 7 6 5 4
♦ A 10 5
♣ Q J
 
As East, a negative double of 1♣ (1♦) shows 4-4 in both majors and is unlimited in points showing 6+ HCP. Partner responds as if East had bid 1♥ or 1♠ and rebids accordingly.
When playing Negative Doubles, a free bid of a suit at the one level usually shows a five-card suit or longer. This is an exception auction. Since the Negative Double shows BOTH 4-card majors in this particular auction, a bid of 1♥ or 1♠ shows a four+-card suit.
 
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