Text: yeah we have tried i mean you know and um i i know where you know where a couple of the mills that have i know i know they put things on their stacks you know to filter the smoke and do all kinds of things but i mean every now and then it breaks you know and and you just got smoke going out into the air for a day or two till you can get it fixed and stuff
Entailment: Sometimes the smoke gets out of the mills anyways.
Contradiction: The smoke is always contained in the mills.