Stuffing and internal combustion engine: what they have in common

1. Step 1. Stuffing — is part of — Teddy bear. Synthetic wadding or sawdust.
2. Step 2. Teddy bear — is made of — Wool. Plush.
3. Step 3. Wool — is part of — Spring mattress. A layer of wool or felt over the springs keeps them from being felt.
4. Step 4. Spring mattress — is made of — Cotton. The cover is cotton fabric.
5. Step 5. Cotton — is material for — Biplane. The covering is fabric.
6. Step 6. Biplane — has part — Internal combustion engine. A piston engine turns the propeller.

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