{HEAD ~ Several yarns} may be combined into {TAIL ~ two or more yarns} for multiple filling insertion simultaneously thus increasing productivity 
combined into
{ HEAD ~ Several yarns } may be combined into { TAIL ~ two or more yarns } for multiple filling insertion simultaneously thus increasing productivity
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH