Samovar crown and Babbage’s Analytical Engine: what they have in common

1. Step 1. Samovar crown — is part of — Samovar. A stand for the teapot.
2. Step 2. Samovar — is made of — Brass. Brass.
3. Step 3. Brass — is material for — Babbage’s Analytical Engine. The parts are brass.

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