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