Landmine and heat pump: what they have in common

1. Step 1. Landmine — uses — TNT. An explosive.
2. Step 2. TNT — is used in — Reactive armour. An explosive.
3. Step 3. Reactive armour — is part of — Tank. Modern tanks.
4. Step 4. Tank — has part — Gas turbine. Some tanks (T-80, Abrams) have a gas turbine engine.
5. Step 5. Gas turbine — has part — Compressor. A compressor.
6. Step 6. Compressor — is part of — Heat pump. A compressor.

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