Take the following as truth: A permit is needed for river and lake fishing; details are available from branches of the Portuguese National Tourist Office (see page 169) or the Instituto Florestal (Avenida Joao Crisestomo 26, 1000 Lisbon).
Then the following statement: "You need a permit to fish in the river and lake, and it costs $15 for residents." is true, false, or inconclusive?