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subroutine fpcyt2(a,n,b,c,nn)
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c subroutine fpcyt2 solves a linear n x n system
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c where matrix a is a cyclic tridiagonal matrix, decomposed
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c using subroutine fpsyt1.
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real*8 a(nn,6),b(n),c(n)
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c(i) = (b(i)-a(i,1)*c(i-1))*a(i,4)
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cc = (b(n)-sum)*a(n,4)
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c(n1) = c(n1)-cc*a(n1,6)
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c(j1) = c(j1)-c(j)*a(j1,3)*a(j1,4)-cc*a(j1,6)