{HEAD ~ A boat} is positioned between the mobile boat supports and the mobile boat supports are moved inwardly on {TAIL ~ the deck} to positions adjacent the boat 
{ HEAD ~ A boat } is positioned between the mobile boat supports and the mobile boat supports are moved inwardly on { TAIL ~ the deck } to positions adjacent the boat
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH