A local anime fan club surveyed 67 of its members regarding their viewing habits last weekend, and the following information was obtained: 30 members watched an episode of Naruto, 44 watched an episode of Death Note, 23 watched an episode of Inuyasha, 20 watched both Naruto and Inuyasha, 5 watched Naruto and Inuyasha but not Death Note, 15 watched both Death Note and Inuyasha, and 23 watched only Death Note.
a. How many of the club members watched exactly one of the shows?
b. How many of the club members watched all three shows?
c. How many of the club members watched none of the three shows?
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