内訳

1. Origins, structure, and basic meaning

• Structure: Written 内訳 and read うちわけ, it is a breakdown showing how a total amount or group is composed of its parts.
• Basic usage: It is used for itemized expenses on a receipt and participant composition organized by age.

2. Common pitfalls and similar expressions

• Composition rather than a mere list
  • It explains how the listed parts make up the whole.