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[4 5 6] [d e f]
[7 8 9] [g h i]
= [1.a+2.d+3.g 1.b+2.e+3.h 1.c+2.f+3.i]
[4.a+5.d+6.g 4.b+5.e+6.h 4.c+5.f+6.i]
[7.a+8.d+9.g 7.b+8.e+9.h 7.c+8.f+9.i]