Only #1 is correct and natural. The other two are ungrammatical

English Teacher
Which of following sentences is acceptable? Which is better?
1. In recent years, we have seen too many examples like this.
2. In recent years, such example is a long list.
3. In recent years, things like this are too numerous to mention.
Only #1 is correct and natural. The other two are ungrammatical
I see nothing ungrammatical in sentence 3, though it is not elegant.
I am not a teacher.
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