Soft hydrogel material and industrial robot: what they have in common

1. Step 1. Soft hydrogel material — is material for — Contact lens. Silicone hydrogel that lets oxygen through.
2. Step 2. Contact lens — is a kind of — Lens. A lens.
3. Step 3. Lens — is part of — Endoscope. Optics.
4. Step 4. Endoscope — is part of — Surgical robot. An endoscopic camera.
5. Step 5. Surgical robot — evolved from — Industrial robot. Manipulators.

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