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subroutine bldenz(ndeg,nj,zfa,zpr,zpi,nb,fact,c1,c0)
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c build denominator blocks of second order -- z-domain
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c subroutine bldenz (ndeg,nj,zfa,zpr,zpi,nb,fact,c1,c0)
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c implicit double precision (a-h,o-z)
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c double precision zpr(*),zpi(*)
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c double precision c1(*),c0(*)
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implicit double precision (a-h,o-z)
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double precision zpr(*),zpi(*)
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double precision c1(*),c0(*)
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flmi=2.0d+0*dlamch('p')
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if (abs(qi).lt.flmi) go to 10
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10 if (n.ge.nj) go to 20
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if (abs(zpi(n+1)).lt.flmi) go to 30