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If you pair up those two groups fire is the odd one out. Air=Gas, Water=Liquid, Solid=Earth. Consider those three together or just focus on fire. That's my thoughts
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In terms of when the "classical" elements of fire/earth/water/air were in use their properties weren't listed in states, since it was known that water could be both solid, liquid, or gas. Rather descriptions of Hot/Cold, Wet/Dry were used which more closely fit the properties of the elements.
Fire is both hot and dry.
Air is both hot and wet.
Water is both cold and wet.
Earth is both cold and dry.
Not sure how useful this is but it's cool to know. Also some symbols, which may or may not be useful.