However this is totally impractical for {HEAD ~ minimally reasonable hash functions} such as {TAIL ~ SHA} 1 
such as
However this is totally impractical for { HEAD ~ minimally reasonable hash functions } such as { TAIL ~ SHA } 1
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL OTH