When two people are this, they have agreed to marry each other.

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Sep 13, 2018 01:00
When two people are this, they have agreed to marry each other.
This sentence is taken from a book. The word "this" confuses me- since this is my first time me seeing the word used in such sentence. This means that in my global knowledge, I know that "this" must be followed, in writing, with a noun! So, what does "this" aims in this sentence?
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