Anchor: We also see signs that Venus and Mars were once more hospitable to life and over many hundreds of millions of years became inhospitable.
Entailed: Over many hundreds of millions of years Venus and Mars became inhospitable, as we can see signs of that.
Contradiction: Venus and Mars never housed life.
Contradiction: There are no signs that Mars or Venus is inhospitable.
Contradiction: There are signs that Venus and Mars were always inhospitable to life.
Contradiction: The five women are sitting at the kitchen table drinking lemonade during the tornado outside.
Contradiction: He had a noseful.