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b1 = 25, b2 = 30, b3 = 42
a11= 2, a12= 3, a13= 2, a14= 1
a21= 4, a22= 1, a23= 3, a24= 2
a31= 3, a32= 5, a33= 2,a34= 2
c1= 6, c2= 5, c3= 4, c4= 3