The spell checker employs {TAIL ~ a dictionary} wherein each word of the dictionary has a signature associated with the word to facilitate searching for {HEAD ~ substitute words} 
The spell checker employs { TAIL ~ a dictionary } wherein each word of the dictionary has a signature associated with the word to facilitate searching for { HEAD ~ substitute words }
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD