a plurality of change retaining tubes each of which retains {HEAD ~ a corresponding type} of {TAIL ~ the deposited coins} 
of
a plurality of change retaining tubes each of which retains { HEAD ~ a corresponding type } of { TAIL ~ the deposited coins }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL