{HEAD ~ The second input transducer} is oriented in {TAIL ~ the opposite direction} from the first input transducer 
is oriented in
{ HEAD ~ The second input transducer } is oriented in { TAIL ~ the opposite direction } from the first input transducer
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH