13.執行下列 Python 程式片段，輸出結果為何? [商技111]
(A) 6
(B) 8
(C) 12
(D) 15
a = [[0] * 4 for _ in range(4)]
for i in range(1, 4):
for j in range(1, 4):
a[i][j] = a[i - 1][j - 1] + i + j
print(a[3][3])

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