Laser surgery and payment card: what they have in common

1. Step 1. Laser surgery — uses — Laser. A laser.
2. Step 2. Laser — is used in — Holography. Coherent light.
3. Step 3. Holography — includes — Security hologram. A hologram.
4. Step 4. Security hologram — is part of — Payment card. A hologram.

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