Writing: Concision, style, and tone — Harder example 2
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Writing: Conventional expression — Basic example
Writing: Conventional expression — Harder example
Writing: End-of-sentence punctuation — Basic example
Writing: End-of-sentence punctuation — Harder example
Writing: Frequently confused words — Basic example
Writing: Frequently confused words — Harder example
Writing: Informative — How-to example
Writing: Items in a series — Basic example
Writing: Items in a series — Harder example