班

1. Origins, structure, and basic meaning

• Structure: 班 (はん) is a noun for a small group formed to carry out a shared task.
• Basic usage: 四人で一つの班を作る forms one practical-work group of four, while 各班の代表が報告する has a representative from each group present results.

2. Common pitfalls and similar expressions

• Formation of one group and representatives of many
  • 一つの班 is one unit, whereas 各班 distributively refers to all groups. The noun does not necessarily mean a whole department or a military formation.