Speech recognition and chisel: what they have in common

1. Step 1. Speech recognition — is used in — Voice assistant. Speech recognition.
2. Step 2. Voice assistant — is used in — Smartphone. A voice assistant.
3. Step 3. Smartphone — has part — LED. The camera flash.
4. Step 4. LED — is part of — Street light. LEDs.
5. Step 5. Street light — is part of — Tunnel. Lighting.
6. Step 6. Tunnel — uses — Chisel. Hezekiah’s Tunnel was cut by hand with chisels.

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