A(F/P,i,n)=(A/P,i,n)X(F/A,i,n)
B(F/A,i,n)=(F/P,i,n)X(P/A,i,n)
C(A/P,i,n)X(F/A,i,n)X(P/F,i,n)=l
D(A/P,i,n)=(A/F,i,n)—i
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