So a law of nature which said, say, that Ravenhood is causally linked with blackness would entail both All ravens are black and All non-black things are non-ravens, but would not entail a law linking non-blackness with non-ravenhood.
I always take the transit to work.
Two short pitches up a chimney-crack are followed by a traverse right to the centre of the buttress.
David was beefing last night after Ruth told him off.
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