test possible behavior that exhibits the
error.&nbsp;  You can direct TLC to use a depth-first iterative
deeping (DFID) search by choosing the <em>Depth-first</em> option
and specifying the depth of its search.&nbsp;  (Limiting the depth ensures
that only a finite set of states is explored, even if
the complete set of reachable states is infinite.)&nbsp;
With DFID search, TLC will usually not produce
a shortest-length error trace.&nbsp;  When running in DFID
mode, TLC does not compute the entire state graph