Abrasive and modem: what they have in common

1. Step 1. Abrasive — is material for — Sandpaper. An abrasive.
2. Step 2. Sandpaper — is made of — Paper. The backing.
3. Step 3. Paper — is material for — Loudspeaker. The cone is paper.
4. Step 4. Loudspeaker — is part of — Telephone. The earpiece reproduces the other person’s voice.
5. Step 5. Telephone — is used in — Modem. It works over a telephone line.

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