Consider the following octahedral complex structures, each involving ethylene diamine and two different, unidentate ligands X and Y. 
Which, if any, of the following pairs are optical isomers?
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Sufficient Consideration
A vital element in contract law, referring to something of value exchanged between parties that is necessary to form a legally binding agreement.
UCC
Uniform Commercial Code, a comprehensive set of laws governing commercial transactions in the United States.
New Consideration
In contract law, additional or different terms, conditions, or considerations offered upon renegotiating or amending an existing agreement.
Matured
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