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Initial value:
b3v=a12*c11
b2v=(-2*
c22*a11s*a12**2+2*
c22*a12s*
a11*a12+a12*
c1*
a11*a22+a12*c11r*
a11*a22-a12r*c11*a21*a12+a12r*c11*
a11*a22-c11r*a21*a12**2-
c1*a21*a12**2)/(-a21*a12+
a11*a22)
b1v=(-2*
c22*a21*a12s**2+2*
c22*a11s*a12s*a22+2*
c22*a12s*
a11*a22s-2*
c22*a11s*a12*a22s+
c22*a12ss*a21*a12+4*
c22*a12s*
a11*a12r-
c22*a12ss*
a11*a22-4*
c22*a11s*a12*a12r+a12*c1r*
a11*a22+a12*
c2*a21*a12s-a12r*
c1*a21*a12+a12r*
c1*
a11*a22-c1r*a21*a12**2-
c2*
a11*a12s*a22)/(-a21*a12+
a11*a22)
! -- Here are
the approximations
for urs