{HEAD ~ An input/output port} allows {TAIL ~ encrypted/unencrypted data} to be input to/output from the BCU 
allows
{ HEAD ~ An input / output port } allows { TAIL ~ encrypted / unencrypted data } to be input to / output from the BCU
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH