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{1: Cv == Vr*sqrt(k/(SWL*g)) + 1, 2: Cv*SWL == Design}
(Cv - 1)^2 == Cv*alpha
Cv^2 - Cv*alpha - 2*Cv + 1 == 0
Cv == 1/2*sqrt(alpha + 4)*sqrt(alpha) + 1/2*alpha + 1
DF == BST*NLL/SWL
DF == 5
DF == 5/2*Cv
[DF == BST*NLL/SWL, DF == 5]