Monthly calendar pages and gas lamp: what they have in common

1. Step 1. Monthly calendar pages — is part of — Wall calendar. A grid of days.
2. Step 2. Wall calendar — is made of — Paper. Calendars were printed on paper.
3. Step 3. Paper — is material for — Hot air balloon. It was lined with paper on the inside.
4. Step 4. Hot air balloon — has part — Gas burner. It heats the air in the envelope with a propane flame.
5. Step 5. Gas burner — is part of — Gas lamp. A coal-gas burner.

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