Show that each of the following congruences holds.
a) 13 ≡ I (mod 2)
b) 22 ≡ 7 (mod 5)
c) 91 ≡ 0 (mod 13)
d) 69 ≡ 62 (mod 7)
e) −2 ≡ 1 (mod 3)
f) −3 ≡ 30 (mod 11)
g) 111 ≡ −9 (mod 40)
h) 666 ≡ 0 (mod 37)
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