Anchor: A proper RFP is a critical element of a successful acquisition because it becomes part of the binding contract once a proposal is made and accepted.
Entailed: Proper RFPs are critical elements of successful acquisition as they are part of the binding contract. 
Contradiction: A proper RFP is never needed for successful acquisitions. 
Contradiction: Two puppies, one black and one white, play in a field.
Contradiction: Often a single absorber will serve multiple boilers 
Contradiction: The new backstreets here are overwhelmed with tourists.
Contradiction: Three people are enjoying the sun at the beach.