A first wire in the two wire output port is a data wire and {HEAD ~ a second wire} in said {TAIL ~ the wire output port} is a clock wire 
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A first wire in the two wire output port is a data wire and { HEAD ~ a second wire } in said { TAIL ~ the wire output port } is a clock wire
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH