{HEAD ~ The carbohydrates} have {TAIL ~ a synergistic activity} on promoting bifidobacteria in the intestine 
have
{ HEAD ~ The carbohydrates } have { TAIL ~ a synergistic activity } on promoting bifidobacteria in the intestine
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH