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g(4) = -3 (fog)(3)=7
g(3) = -4 (fog)(4)=8
g(2) = -5 (fog)(5)=9
f(g(2))=6
f(-5) = 6
f(g(3))=7
f(-4)=7
f(g(4))=8
f(-3) = 8
f(g(5))=9
f(-2) = 9
f = {(-2,9),(-3,8),(-4,7),(-5,6)}