Study the following pattern:
1 + 3 = 2 x2
1 + 3 +5 = 3 x 3
1 + 3 + 5 + 7 = 4 x 4
1 + 3 + 5 + 7 + 9 = 5 x 5
By observing the pattern above , find
31 + 33 + 35 + 37 + 39 +41 + 43 + 45

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