input:n(0.05); a1:=ma(c,5); a2:=ma(c,10); a3:=ma(c,20); abs(a1/a2-1)<n and abs(a1/a3-1)<n and abs(a3/a2-1)<n and cross(c,a1) and cross(c,a1) and cross(c,a1) and c>o;
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