{HEAD ~ The drivetrain} 22 may selectively couple to {TAIL ~ any number} of driven wheels in a manner known in the art 
{ HEAD ~ The drivetrain } 22 may selectively couple to { TAIL ~ any number } of driven wheels in a manner known in the art
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH