Simplify the expression. 
Definitions:
Document
constitutes any written, typed, or digital material that provides information or evidence or serves as an official record.
Selling Price
The amount of money for which a product or service is sold to the buyer.
Subject Matter
The specific topic, area, or thing under discussion or consideration, often within a legal, academic, or artistic context.
Portrait Painter
An artist specialized in creating representations of individuals, typically focusing on their facial features and expressions to convey personality and mood.
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