Can anyone tell me how I would use the datalog = and != tokens? The 
documentation says they can separate terms, such as <term> != <term>. In the 
program below, how would I create a query for foo(x, ?) where ? is not 3?

#lang datalog

foo(bil, 1).
foo(bob, 3).
foo(joe, 2).

I imagine I’d have to create a rule of some sort. 


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