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   ocr: (a) y=Ayi - Byitl + Cyr+Dyl c) - dx dy VH1-Vi XHITX LTsn2-1)n -x) (b) 1= MTX Xi+1-X AIsP-1s-xbal B=l-A - celTA-A)sm-sfl (d) a=30441-) b=6MHY-XMA) D-Ele-alsu-a) c=6y4-6y -12x-4+2x44) (An-237-244) X4 Figure 1: Equations for deriving the algorithm.