The rules determining what combination of 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 {TAIL ~ the data domains} on which {HEAD ~ the search} is performed 
on is performed
The rules determining what combination of 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 { TAIL ~ the data domains } on which { HEAD ~ the search } is performed
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