Let H be the orthocenter; Ha, Hb, Hc its orthogonal projections on the perpendicular bisectors of the sides. Let Hab, Hac be the orthogonal projections of Ha on the perpendicular bisectors of CA, AB and define analogously Hbc, Hba, Hca, Hcb. The parallels to the Euler lines of HaHabHac, HbHbcHba, HcHcaHcb
from A, B, C: concur at the point X(74)
from the midpoints of the sides: concur in the complement of the point X(74)
from the altitude feet A', B', C': concur at a point