N:=3;M:=12; MON:C-REF(C,N); MID:=MA(MON,20); AA:=POW((MON-MID),2); BB:=MA(AA,20); CC:=SQRT(BB); SG:MID+2*CC; LG:MID-2*CC; XG:CROSS(MON,LG)COLORBLUE;
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