Premise: Seamus Heaney's poem The Little Canticles of Asturias, which appeared in the debut issue of SLATE, contains a mesmerizing image of a smouldering maw/ of a pile of newspapers lit long ago, fanning up in the wind, breaking off and away/ in flame-posies, small airborne fire-ships.

Hypothesis: Slate posted Heaney's poem in the first issue.
Relation: entailment