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1. Origins, structure, and basic meaning

• Structure: 概 has 14 strokes and appears in words for general content and approximate quantities.
• Basic usage: 概要（がいよう） means an overview; 概算（がいさん） means a rough estimate.

2. Common pitfalls and similar expressions

• Summarizing content and estimating quantities
  • In 計画の概要を一枚にまとめた, the plan's main points were summarized on one sheet.
  • 概算で二時間ほどだ means roughly estimated at about two hours.
  • ほど marks the quantity as approximate.