File teeth and internet: what they have in common

1. Step 1. File teeth — is part of — File. Rows of fine teeth.
2. Step 2. File — works like — Sandpaper. Removing material with small cutting edges.
3. Step 3. Sandpaper — is made of — Paper. The backing.
4. Step 4. Paper — is material for — Colossus. The data is on paper punched tape.
5. Step 5. Colossus — is a kind of — Computer. An electronic computer.
6. Step 6. Computer — is part of — Internet. The Internet links billions of computers.

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