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X(1), X(3), X(2635)* excenters extraversions of X(2635)* vertices of the cevian triangle of O 

Q084 is the isogonal transform of the stelloidal quartic Q083. It follows that Q084 is a quintic meeting the circumcircle at A, B, C and at the vertices of a square. A, B, C are nodes with tangents the bisectors of ABC. 
