Broom and tank: what they have in common

1. Step 1. Broom — evolved into — Mop. A cleaning tool.
2. Step 2. Mop — is made of — Cotton. A mop is cotton strands.
3. Step 3. Cotton — is material for — Ironing board. Covered with a cotton cover.
4. Step 4. Ironing board — has part — Cover. A heat-resistant cover.
5. Step 5. Cover — is part of — Body armour. A carrying cover.
6. Step 6. Body armour — works like — Tank. One idea of protection — armour — at different scales.

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