Anchor: The model assumes that there are two primary determinants of cost for a postal  volume and size of the network.
Entailed: The model assumes two primary determinants. 
Contradiction: The cost of postal volume is the only determinant. 
Contradiction: The paper refused to reply to her inquiry about a refund.
Contradiction: Should this guess about how some infinite series might be solved prove true, there could be big implications about the natural numbers.
Contradiction: In despair, she jumps off a building and kills herself.
Contradiction: The brown dog is energetic.