Avoiding "legalese"
Especially in white papers or other marketing documents that need a formal writing style, it can be easy to include "legalese" words such as heretofore, whereas, and above-mentioned.
These words are often confusing for readers and can create a style that is unnecessarily stiff. Substitutes can be easily found that are more understandable while still maintaining a sense of formality.
For see a list of similar words and expressions to avoid, see this list from the US Federal Register: Drafting Legal Documents

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