AP(P/F,i,ι)=A(PlA,i,-n-m)(P/F,i,m)
BP(F/P,i,m-ι)=A(P/A,i,n-m)
CP=A(P/A,i,n-m)(P/F,i,m-ι)
DP(F/P,i,n-ι)=A(F/A,i,n-m+1)
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