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A1=[cos(r1) -sin(r1) 0 0;sin(r1) cos(r1) 0 0;0 0 1 0;0 0 0 1]* [1 0 0  0;0 1 0 0;0 0 1 0 ;0 0 0 1] * [1 0 0 0;0 0 -1 0;0 1 0 0;0 0 0 1]
A2=[cos(r2) -sin(r2) 0 0;sin(r2) cos(r2) 0 0;0 0 1 0;0 0 0 1]* [1 0 0  a2;0 1 0 0;0 0 1 0;0 0 0 1] * [1 0 0 0;0 1  0 0;0 0 1 0;0 0 0 1]
A3=[cos(r3) -sin(r3) 0 0;sin(r3) cos(r3) 0 0;0 0 1 0;0 0 0 1]* [1 0 0  a3;0 1 0 0;0 0 1 0;0 0 0 1] * [1 0 0 0;0 1  0 0;0 0 1 0;0 0 0 1]
A4=[cos(r4) -sin(r4) 0 0;sin(r4) cos(r4) 0 0;0 0 1 0;0 0 0 1]* [1 0 0  a4;0 1 0 0;0 0 1 0;0 0 0 1] * [1 0 0 0;0 1  0 0;0 0 1 0;0 0 0 1]

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