The rules determining {HEAD ~ what combination} of {TAIL ~ characters} constitute valid full words is dependent on the system implementing the search and can vary from system to system based on a variety of factors, including but not limited to the data domains on which the search is performed 
The rules determining { HEAD ~ what combination } of { TAIL ~ characters } constitute valid full words is dependent on the system implementing the search and can vary from system to system based on a variety of factors , including but not limited to the data domains on which the search is performed
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