{HEAD ~ A high frequency semiconductor device} contains {TAIL ~ a semiconductor element} in a cavity formed by a dielectric board and a cap 
contains
{ HEAD ~ A high frequency semiconductor device } contains { TAIL ~ a semiconductor element } in a cavity formed by a dielectric board and a cap
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH