What is the correct version of this sentence?
If clauses can be switched around and still make sense a comma should separate them.
If clauses can be switched around, and still make sense, a comma should separate them.
If clauses can be switched around and still make sense, a comma should separate them.

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What is the correct version of this sentence?If clauses can be switched around and still make sense a comma should separate them.If clauses can be switched around, and still make sense, a comma should separate them.If clauses can be switched around and still make sense, a comma should separate them.