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sage: mq = matrix(SR, 2, 2, 'a b c d'.split(' '))
sage: MQ = block_matrix(SR, 2, 2, [mq, mq, mq, mq]); MQ
[a b|a b]
[c d|c d]
[---+---]
[a b|a b]
[c d|c d]
sage: MQ.det()
0

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