In making {HEAD ~ the seam} along {TAIL ~ edge A}, it may be easier to turn the fabric over in order more accurately to follow edge A in making a second seam 
In making { HEAD ~ the seam } along { TAIL ~ edge A } , it may be easier to turn the fabric over in order more accurately to follow edge A in making a second seam
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH