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In a recent survey of 100 women, the following information was gathered.
53 use shampoo A.
31 use shampoo B.
31 use shampoo C.
4 use shampoos A and B.
10 use shampoos A and C.
13 use shampoos B and C.
3 use all three.
Use the figure to answer the question in the problem.

How many are using shampoos A and C, but not B (Region IV)?

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