D1:=(L+H+C*2)/4;
D2:= MA(D1,4);
D3:=HHV(D2,10);
D4:=MA(D3,3);
D5:=1.25*D4-0.25*D3;
A:=IF(D5>D3,D3,D5);
F1:=LLV(D2,10);
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F2:=MA(F1,3); F3:=1.25*F2-0.25*F1;
B:=IF(F3 MA13:=MA(C,13);
GX:CROSS(C,B) AND CROSS(C,MA13) AND CROSS(C,A);