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fs(f, s) = map(f, s)
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f1(x) = 2x
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f2(x) = x^2
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fsf1(s) = fs(f1, s)
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fsf2(s) = fs(f2, s)
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s1 = [0, 1, 2 ,3]
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s2 = [2, 4, 6, 8]
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println("fsf1 of s1 is $(fsf1(s1))")
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println("fsf2 of s1 is $(fsf2(s1))")
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println("fsf1 of s2 is $(fsf1(s2))")
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println("fsf2 of s2 is $(fsf2(s2))")
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