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((5n^2(m^2+2m−3))/(10n(m^2−3m+2)))/ ((n^2(m^2−3m−18))/(4n^2(m^2−8m+12)))
((5n^2(m^2+2m−3))/(10n(m^2−3m+2)))/ ((n^2(m^2−3m−18))/(4n^2(m^2−8m+12)))
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