Team Fortress 2 has the following lines in *Crafting Items* menu:

- **Smelt primary weapons** (2 of the same primary weapon)
- **Smelt secondary weapons** (2 of the same primary weapon)
- **Smelt melee weapons** (2 of the same melee weapon)
- **Smelt class weapons** (2 weapons used by the same class)

All these produce ***1* Scrap Metal**.

So, why are the first three items needed, if 2 of the same weapons are always used by the same class anyway?