At the position, {HEAD ~ the bead} 62 is engaged with {TAIL ~ the notch} 33 
is engaged with
At the position , { HEAD ~ the bead } 62 is engaged with { TAIL ~ the notch } 33
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH