{HEAD ~ S3} may be performed on {TAIL ~ the basis} of a recipe A, that is, each of the process steps S1 . .  
performed on
{ HEAD ~ S3 } may be performed on { TAIL ~ the basis } of a recipe A , that is , each of the process steps S1 . .
HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH