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Related Clues:
- Marsh gas
- Biofuel option
- Marsh gas, mostly
- Hydrogen and methane (Var.)
- Neon and argon
- Helium and neon, for two
- A greenhouse gas
- Greenhouse gas
- Swamp gas, essentially
- Firedamp, for the most part
- Neon and others
- Substances that are not solidor liquid
- Seems that it's myself that used to be entitled to be in Scotland - great gas!
- Gee! That's how 35 across without any tea is the death of you
- Me? A noble old Scotsman and a fiery old gasbag