Let Aa, Ab, Ac be the contact points between the A-excircle and the sides BC, CA, AB. Let Na be the ninecenter of  AaAbAc. Define analogously Bb, Bc, Ba, Cc, Ca, Cb , Nb, Nc. The lines AaNa, BbNb, CcNc are parallel to the line OI (O circumcenter, I incenter).