Shovel blade and programmable logic controller: what they have in common

1. Step 1. Shovel blade — is part of — Shovel. A steel plate that cuts into the ground.
2. Step 2. Shovel — works like — Trowel. A trowel is a mason's small flat shovel.
3. Step 3. Trowel — is used in — Brick. Bricklaying with a trowel.
4. Step 4. Brick — is material for — Chemical plant. The furnaces and towers are brick.
5. Step 5. Chemical plant — has part — Programmable logic controller. Process control automation.

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