The following peptides are separated using an anion exchange resin in ion-exchange chromatography. Which peptide is eluted first? 
Definitions:
Labor
The combined physical and mental exertion employed in creating goods and services.
Marginal Physical Product
The change in total physical output that results from a one-unit increase in the quantity of one input, holding other inputs constant.
Marginal Revenue Product
The extra income derived from the use of an additional unit of a resource or input in production.
Input
Resources such as labor, materials, and capital that are used in the production process to create goods and services.
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