The six words following all have an unusual property in common. Which one of the four lettered choices shares this property?  EMIT, STOP, STRAW, REFLIP, GATEMAN, TRESSED.  The answer is Gateman.  I could not figure it out even after I got the answer.  Maybe since they all can be spelled backward has something to do with it.  This was given at a Senior Citizen Mental Floss class.  If you can figure it out, I would appreciate you letting me know. Thanks Barbara Bush