The belt portion 10 is provided with {TAIL ~ a series} of {HEAD ~ cogs} 12 on the rear side along the longitudinal direction 
The belt portion 10 is provided with { TAIL ~ a series } of { HEAD ~ cogs } 12 on the rear side along the longitudinal direction
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH