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