|t1> => find-topic[words] (|adelaide>) |t2> => find-topic[words] (|adelaide> + |perth>) |t3> => find-topic[words] (|adelaide> + |perth> + |sydney>) |t4> => find-topic[words] (|adelaide> + |perth> + |sydney> + |melbourne>) |t5> => find-topic[words] (|adelaide> + |perth> + |sydney> + |melbourne> + |brisbane>) |t6> => find-topic[words] (|adelaide> + |perth> + |sydney> + |melbourne> + |brisbane> + |hobart>) |t7> => find-topic[words] (|adelaide> + |perth> + |sydney> + |melbourne> + |brisbane> + |hobart> + |darwin>) |t8> => find-topic[words] (|adelaide> + |perth> + |sydney> + |melbourne> + |brisbane> + |hobart> + |darwin> + |canberra>) |list> => |t1> + |t2> + |t3> + |t4> + |t5> + |t6> + |t7> + |t8>