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