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 {HEAD ~ a variety} of {TAIL ~ factors}, including but not limited to the data domains on which the search is performed 
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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 { HEAD ~ a variety } of { TAIL ~ factors } , including but not limited to the data domains on which the search is performed
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