Rate the following argument fragment on its writing, argument, and language skills:
Evidence: First the process begins when the computer constructs a 3-D computer model of the face; all 44 major muscles in the model must move like human muscles. Movement of one or more muscles is called an action unit. Then Dr. Huang relies on the work of psychologists, such as Dr. Paul Eckman, creator of FACS (Facial Action Coding System). Eckman has classified six basic emotions happiness, surprise, anger, disgust, fear, and sadness and then associated each with characteristic movements of the facial muscles.

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