{HEAD ~ These codes} are straightforward to design and provide {TAIL ~ better performance} than the known codes 
are straightforward to provide
{ HEAD ~ These codes } are straightforward to design and provide { TAIL ~ better performance } than the known codes
HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH