Preferably, {TAIL ~ the second step} 46 is positioned adjacent to {HEAD ~ the second end} 18 
Preferably , { TAIL ~ the second step } 46 is positioned adjacent to { HEAD ~ the second end } 18
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH