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