Where continued rotation is desired, {HEAD ~ the cycle} is repeated to advance {TAIL ~ the motor} another step 
Where continued rotation is desired , { HEAD ~ the cycle } is repeated to advance { TAIL ~ the motor } another step
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH