Find the distance between the planes. 
Definitions:
Illusory Promise
An agreement that lacks a firm commitment or terms, making it unenforceable by law.
Accord and Satisfaction
A legal settlement where a debtor offers payment or performance different from what was originally agreed, and the creditor accepts it as full settlement of the debt.
UCC
A complete collection of legal regulations that administer all business dealings across the United States, known as the Uniform Commercial Code.
Preexisting Duty
A promise to do something that one is already obligated to do. It is not considered valid consideration.
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