File teeth and electric motor: what they have in common

1. Step 1. File teeth — is part of — File. Rows of fine teeth.
2. Step 2. File — works like — Sandpaper. Removing material with small cutting edges.
3. Step 3. Sandpaper — is made of — Abrasive. An abrasive.
4. Step 4. Abrasive — is used in — Grinding machine. An abrasive wheel.
5. Step 5. Grinding machine — has part — Electric motor. The drive.

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