{HEAD ~ The ends} of the ribbon are provided with {TAIL ~ hook shaped retainers} for engagement below parts of a waler and tension elements for fixing the hook strap 
are provided with
{ HEAD ~ The ends } of the ribbon are provided with { TAIL ~ hook shaped retainers } for engagement below parts of a waler and tension elements for fixing the hook strap
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH