Think this is right.
Win - we go through as group winners
Draw and Sevilla lose or draw - we go through as group winners
Draw and Sevilla win - we go through in second place
Lose and Sevilla win - Europa League
Lose and Sevilla draw - complicated - same points, same points in games v Sevilla, same goal difference in games v Sevilla, same goals scored in games v Sevilla, but we've got more away goals in games v Sevilla - we go through in second place, Sevilla in Europa League
Lose and Sevilla lose - through in second place
Top option seems the simplest.
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