Aluminium foil layer and computer: what they have in common

1. Step 1. Aluminium foil layer — is part of — Tetra Pak. A barrier against light and oxygen.
2. Step 2. Tetra Pak — is made of — Paper. Cardboard.
3. Step 3. Paper — is material for — Colossus. The data is on paper punched tape.
4. Step 4. Colossus — is a kind of — Computer. An electronic computer.

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