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It works at least on the last Sage version, perhaps should you upgrade to the latest Sage 6.3 :
sage: P.faces(3)
(<0,1,2,3,4,5>,)
sage: P.faces(2)
(<0,1,2>, <0,1,3>, <0,2,4>, <0,3,4>, <3,4,5>, <2,4,5>, <1,3,5>, <1,2,5>)
