{HEAD ~ Each transducer} can be in {TAIL ~ communication} with a header for supporting the transducer 
{ HEAD ~ Each transducer } can be in { TAIL ~ communication } with a header for supporting the transducer
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH