Hammer head and programmable logic controller: what they have in common

1. Step 1. Hammer head — is part of — Hammer. The striking part.
2. Step 2. Hammer — has part — Handle. A handle.
3. Step 3. Handle — is part of — Trowel. A handle on a curved neck.
4. Step 4. Trowel — is used in — Brick. Bricklaying with a trowel.
5. Step 5. Brick — is material for — Chemical plant. The furnaces and towers are brick.
6. Step 6. Chemical plant — has part — Programmable logic controller. Process control automation.

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