Anchor: They arranged a plan to throw suspicion on John Cavendish, by buying strychnine at the village chemist's, and signing the register in his hand-writing. 
Entailed: The village chemist sells strychnine and has a register.
Contradiction: The strychine was not purchased in John Cavendish's name.
Contradiction: Some cats are sleeping.
Contradiction: Three teenagers in yellow shirts are cooking together.
Contradiction: The woman is inside.
Contradiction: Questions are raised by allowing contracts with government postal services.