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Why are these 2 phrases different? One uses "to" between the two nouns and the
other doesn't. Is the "to" optional? Is one of them incorrect?

"Hikaru sora **_to_** kumo no aida tooku habataku toritachi"

"Teeburuto doa no aida yo."
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2017-03-13T00:45:11.027
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2017-03-13T04:39:59.623
2017-03-13T04:39:59.623
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question
particle-と
When you have to use "to" when using "no aida" to express "in between"
Both sentences use 「と」 between nouns.

[Hikaru sora]to[kumo] 「ひかるそら」と「くも」

[Teeburu]to[doa] 「テーブル」と「ドア」

When saying "Between A and B", you need to use 「と」. However, as you may
already know, usage of 「間（あいだ）」 itself does not necessarily require the use of
「と」 in other forms of use, such as 「その間」.
CC BY-SA 3.0
2017-03-13T00:55:43.873
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2017-03-13T04:32:34.923
2017-03-13T04:32:34.923
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answer