Wooden pencil casing and bicycle: what they have in common

1. Step 1. Wooden pencil casing — is part of — Pencil. A cedar or lime-wood casing.
2. Step 2. Pencil — is made of — Graphite. The lead is graphite mixed with clay.
3. Step 3. Graphite — is material for — Anode (graphite). The anode of a lithium-ion battery is graphite.
4. Step 4. Anode (graphite) — is part of — Lithium-ion battery. The graphite anode takes in lithium ions during charging.
5. Step 5. Lithium-ion battery — is part of — Electric bicycle. A battery.
6. Step 6. Electric bicycle — evolved from — Bicycle. A bicycle with an electric drive.

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