- - Xenon and krypton, for two
- - Nitrogen & xenon
- - oxygen and neon, for two
- - Krypton & radon
- - Nitrogen and oxygen, for two
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- [ Other definitions ]
- - Name for helium, neon, argon, krypton, xenon and radon
- - Neon, argon and krypton
- - Helium, neon, et al.
- - Argon and xenon
- - He, Ne, Ar, Kr, Xe, Rn and Og?
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- [ Other definitions ]
- - Like krypton and xenon
- - like argon and xenon
- - Chemically inactive, like Helium
- - like krypton and neon
- - like a nonreactive element
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- [ Other definitions ]
- - Krypton and xenon
- - 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
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- [ Other definitions ]
- - Krypton and xenon
- - Krypton, xenon, etc.
- - Helium and neon, e.g.
- - Krypton and others
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- [ Other definitions ]