one and the same
One and the same vs. one in the same, the phrase for two things that are identical.
Use one and the same. One in the same is a slip.
Examples
UseThe two keys are one and the same.
AvoidThe two keys are one in the same.
One and the same vs. one in the same, the phrase for two things that are identical.
Use one and the same. One in the same is a slip.
UseThe two keys are one and the same.
AvoidThe two keys are one in the same.