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