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Pool D contains: Argentina (6th), England (8th), Samoa (12th), Japan (14th) and Chile (22nd). Chile will find it pretty hard going, but given 4 years ago no-one should treat Japan lightly. Plus, with Samoa not that far behind England, it's certainly a chance that they go through.
The first Pool D match is England v Argentina, and whoever loses that could essentially be in knock-out mode for the rest of their tournament as a second loss would see them out.