truth)</tt><br />Find the first gaf assertion such that:<br /><code></code>(a) the assertion is in a relevant microtheory (relevance is established outside)<br /><code></code>(b) if TRUTH is non-nil, the assertion has TRUTH as its truth value<br /><code></code>(c) PRED is the predicate used.<br /><code></code>(d) TERM is the term in the INDEX-ARG position.<br /><code></code>Return T if such an assertion exists, otherwise return NIL.<br />TERM must satisfy INDEXED-TERM-P.<br />PRED must satisfy FORT-P.<br />