The cow is back (piled higher and deeper) with If Cow, Then Poo II: Modus Tollens and Denying the Antecedent. Watch out for bacon, vikings, spiders, and bow ties in the second installment of cow pies and deductive logic. It's mooooving. Other Titles in the Deductive Logic Series If Cow, Then Poo: Modus Ponens and Affirming the Consequent Cow or Pig: Disjunctive Syllogism and the Inclusive "Or".