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* TRAVEL MAY BE VIA ANY GLOBAL ROUTING IN (AP/EH OR AT/EH/PA OR EH/TS OR AP/TS) B U T TRAVEL MUST N O T BE VIA AP/AP (I.E. VIA ATLANTIC/PACIFIC IN EACH DIRECTION). A L L TRAVEL MUST BE IN ACCORDANCE WITH ROUTINGS.
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This just says that overall you have to travel in a continuous direction, either eastward or westward, you can't, for example, go from Australia to Europe via North America and back via South America. Within a contintent some backtracking is permitted.