{HEAD ~ The x ESDS} displace both the DES and {TAIL ~ UES} once they have been used x number of times  
displace
{ HEAD ~ The x ESDS } displace both the DES and { TAIL ~ UES } once they have been used x number of times
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH