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(as) far as sb know
01
used to express one's uncertainty about the statement one has made as there might be something that makes it untrue
Example
As far as we know, the company is expanding its operations.
As far as he knew, the concert had already started when he arrived.
They are planning a surprise party for her, as far as he knows.
The company is expanding its operations, as far as we know.
Far as I know, she works as a teacher.