- - What an aerosol might cover up
- - Onions have a strong one
- - methane doesn't have one
- - have too much "hospital area" smell
- - Natural gas doesn't have one
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- - Spanish count for a chemist?
- - Minute nutritional components, to a Spanish count?
- - A number of chemical rarities in Madrid?
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- - Propane & helium
- - Helium & argon
- - Hydrogen, oxygen, nitrogen, etc.
- - oxygen and neon, for two
- - Nitrogen and oxygen, for two
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- - Fire, air, earth and water
- - The ... of Style (writing guide by Strunk and White)
- - A mathematical and geometric treatise consisting of 13 books written by the Greek mathematician Euclid
- - Zinc and zirconium, for example
- - bread and wine and other ingredients
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- - Argon or ozone
- - struggle for breath almost in helium, perhaps
- - Helium or oxygen, for one
- - Hydrogen, say
- - what e-cars avoid
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- - like argon and xenon
- - not exactly bouncing off the walls
- - Chemically inactive, like Helium
- - not moving (physically) or not reacting (chemically)
- - like krypton and neon
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- - Erbium, terbium or ytterbium
- - Sodium or silver for example
- - fire, air, earth or water that provides heat
- - he or i, but not him
- - Hydrogen, for example
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