Consider the following function. 
Determine the values of a for which 
exists.
Definitions:
Self-Service
A business model or technology that allows customers to perform services for themselves without the need for direct assistance from staff.
Fast Fashion
The rapid translation of high-fashion design trends by lower-cost manufacturer-retailers.
Online Retailing
B2C electronic commerce in which individual consumers directly buy goods or services over the Internet; also known as e-retailing.
E-Retailing
The selling of goods and services through online platforms, also known as electronic retailing, encompassing a wide range of online business models.
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