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  1. or download this
    Anyway ... given the matrices
A = 71 x 35
B = 35 x 35
C = 35 x 7
D = 7 x 7
  2. or download this
    (71x35) x (35 x 35) x (35 X 7) x (7 x 7)
  3. or download this
     A x B x C x D