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