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B=[b11 b12 b13 b14]
[b21 b22 b23 b24]
[b31 b32 b33 b34]
[b41 b42 b43 b44]4x4
b11=1.2+3.1=5
b12=1.2+3.2=8
b13=1.2+3.3=11
b14=1.2+3.4=14
b21=2.2+3.1=7
b22=2.2+3.2=10
b23=2.2+3.3=13
b24=2.2+3.4=16
b31=3.2+3.1=9
b32=3.2+3.2=12
b33=3.2+3.3=15
b34=3.2+3.4=18
b41=4.2+3.1=11
b42=4.2+3.2=14
b43=4.2+3.3=17
b44=4.2+3.4=20
[5 8 11 14]
[7 10 13 16]
[9 12 15 18]
[11 14 17 20]
[b21 b22 b23 b24]
[b31 b32 b33 b34]
[b41 b42 b43 b44]4x4
b11=1.2+3.1=5
b12=1.2+3.2=8
b13=1.2+3.3=11
b14=1.2+3.4=14
b21=2.2+3.1=7
b22=2.2+3.2=10
b23=2.2+3.3=13
b24=2.2+3.4=16
b31=3.2+3.1=9
b32=3.2+3.2=12
b33=3.2+3.3=15
b34=3.2+3.4=18
b41=4.2+3.1=11
b42=4.2+3.2=14
b43=4.2+3.3=17
b44=4.2+3.4=20
[5 8 11 14]
[7 10 13 16]
[9 12 15 18]
[11 14 17 20]
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