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