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Matrix multiplication v1
def matrix_multiply(m_1, m_2):
assert len(m_1[0]) == len(m_2)
r = list(map(lambda m: sum([x * y for x, y in zip(*m)]), [(x, y) for x in m_1 for y in zip(*m_2)]))
return [r[x:x+len(m_2[0])] for x in range(0, len(m_1)*len(m_2[0]), len(m_2[0]))]
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