The disk pairs are detachably attached, at least one disk of each pair being fixedly attached by flexible means to {HEAD ~ a disk} of {TAIL ~ an adjoining pair} 
of
The disk pairs are detachably attached , at least one disk of each pair being fixedly attached by flexible means to { HEAD ~ a disk } of { TAIL ~ an adjoining pair }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL