This document discusses code phrases and sentence structure. It defines code phrases as words that have a specific meaning to the writer but multiple meanings to the reader. It recommends replacing code phrases with specific details, descriptions, or concrete examples. The document also discusses four basic sentence types - simple, compound, complex, and compound-complex sentences. It advises using a variety of sentence types to improve writing by varying tone and representing connections between ideas. Readers are encouraged to identify code phrases in their own writing and experiment with different sentence structures.