15. The method of claim 1 , wherein one or more comparisons of the first plurality of comparisons include determinations of whether (1) said each query ends with the particular query and (2) the particular query is not equal to said each query.
34. A volatile or non-volatile machine-readable medium storing one or more sequences of instructions which, when executed by one or more processors, causes the one or more processors to perform the method recited in claim 15 .