{HEAD ~ a push button array} including {TAIL ~ a plurality} of push buttons for accomplishing various vacuum valving functions, 
{ HEAD ~ a push button array } including { TAIL ~ a plurality } of push buttons for accomplishing various vacuum valving functions ,
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH