The actual rule is:
160N . 4. 1 INTL DEPARTURE AND 1 INTL ARRIVAL
161N . FROM/TO THE COUNTRY OF ORIGIN PERMITTED
162N . EXCEPT AS FOLLOWS.
163N . - ORIGIN AUSTRALIA - 2 PERMITTED.
164N . 1 ARRIVAL-DEPARTURE MUST BE A TRANSIT
165N . WITHOUT STOPOVER IN CONJUNCTION WITH
166N . TRAVEL TO PAPUA NEW GUINEA.
167N . - ORIGIN USA - 2 PERMITTED.
168N . 1 ARRIVAL-DEPARTURE MUST BE A TRANSIT
169N . WITHOUT STOPOVER.
170N . NOTE: TRAVEL BTWN US/CA IS NOT COUNTED AS
171N . INTERNATIONAL DEPARTURE/ARRIVAL.