Flint and multistage rocket: what they have in common

1. Step 1. Flint — is material for — Flintlock. A flint strikes the spark.
2. Step 2. Flintlock — works like — Lighter. The same way of striking a spark.
3. Step 3. Lighter — has part — Wick. Petrol lighters have a wick.
4. Step 4. Wick — is part of — Kerosene lamp. A wick.
5. Step 5. Kerosene lamp — uses — Kerosene. The fuel.
6. Step 6. Kerosene — is material for — Multistage rocket. The fuel is kerosene.

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