Greg owns and runs a dry$-$cleaning store. Greg is implementing a drive$-$thru rental process that is the same as you would find at a fast food restaurant. Customers can pick$-$up and drop$-$off their clothes without leaving their cars. Greg's new system has become so popular that CleanMe!, a competitor down the street, is attempting to recreate Greg's drive$-$thru rental process. Greg's system is an example of a $\_\_\_\_\_\_\_\_.$

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