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I do not know vs i dont know

I do not know vs i dont know which is much better to use in a sentence. Which is more popular in English form?

Looking on the internet deeply has found these results:

I do not know is the most popular phrase on the web.

i dont know

177,700,000 results on the web

I do not know

1127,000,000 results on the web

More popular!

Some examples and use cases from the internet:

Some examples and use cases from the internet:

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