public bool Contains(MotionPoint p) => _start.Equals(p) || _end.Equals(p);
public bool Contains(MotionPoint p) => Start.Equals(p) || End.Equals(p);
public bool Contains(MotionPoint p) => _start.Equals(p) || _end.Equals(p);
public bool Contains(MotionPoint p) => Start.Equals(p) || End.Equals(p);