NFC and chisel: what they have in common

1. Step 1. NFC — is a kind of — RFID. A variety of RFID.
2. Step 2. RFID — is used in — Turnstile. Contactless cards.
3. Step 3. Turnstile — is part of — Metro. Turnstiles.
4. Step 4. Metro — uses — Tunnel. Tunnels.
5. Step 5. Tunnel — uses — Chisel. Hezekiah’s Tunnel was cut by hand with chisels.

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