Reactive armour and railway track: what they have in common

1. Step 1. Reactive armour — uses — TNT. An explosive.
2. Step 2. TNT — works like — Dynamite. Two industrial explosives; TNT is safer to handle.
3. Step 3. Dynamite — is used in — Tunnel. Drilling and blasting.
4. Step 4. Tunnel — is used in — Metro. Tunnels.
5. Step 5. Metro — uses — Railway track. It runs on rails.

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