Mop head and data centre: what they have in common

1. Step 1. Mop head — is part of — Mop. A rag or microfibre head.
2. Step 2. Mop — is made of — Cotton. A mop is cotton strands.
3. Step 3. Cotton — is material for — Vacuum cleaner. The dust bag is a cloth bag.
4. Step 4. Vacuum cleaner — is a kind of — Household appliance. A household appliance.
5. Step 5. Household appliance — includes — Air conditioner. A household appliance.
6. Step 6. Air conditioner — is part of — Data centre. Cooling.

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