|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>