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A small hint

In writing requirements, synonyms do not exist.

An example is "tree" and "plant". 

The two words seem similar, but they have different meanings.

Tree:   "a usually tall plant that has a thick, wooden stem and many large branches"

Plant:   "organism belonging to the vegetable kingdom"


Please note also that tree can mean"a drawing that connects things with lines to show how they are related to each other", while plant suggests a "factory and its buildings and equipment".
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