d	second Brocard parabola
r221	orthocenter, medians
r222	orthocenter, concyclic points
r223	circumcircle, symmedian lines
r556	inverse points
r558	orthologic triangles, centroid, perspective, point X(262)
r627
r687	perspective, circumcircle, symmedian point
r1286	perspective, centroid, altitudes, symmedian point
r1310	orthocentroidal circle
r1311	altitude feet, ninecircle