{HEAD ~ The beads} 21 are preferably commercial stock plastic beads of the type commonly available for plastic injection molding of {TAIL ~ commercial plastic parts} 
{ HEAD ~ The beads } 21 are preferably commercial stock plastic beads of the type commonly available for plastic injection molding of { TAIL ~ commercial plastic parts }
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL