Let A'B'C' be the orthic triangle, A"B"C" the intouch triangle. The reflections of A'B' on A"B", B'C' on B"C", C'A' on C"A" bound a triangle A*B*C* .The Simson lines of A", B", C" with respect to A*B*C* and the Simson lines of A*, B*, C* with respect to A"B"C" concur.