Decide the truth value of each statement.
a. 4 + 7 = 11 and 1 + 5 = 6.
b. 2 + 5 = 7 ⇔ 4 + 2 = 8.
c. 3⋅5 = 12 or 2⋅6 = 11.
d. If 2 + 3 = 5, then 1 + 2 = 4.
e. If 3 + 4 = 6, then 8 ⋅ 4 = 31.
f. If 7 is even, then 8 is even.
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