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