Sentence Correction

Hi,


To x, to y and to z (Correct); to x, y and x (Correct); To x and y (Correct)
With "and" to should repeat if it exists in the second place
To x or to y (Correct); To x or y (Wrong)
With "or" to should always exist on both sides

This is something i have been following as a rule of thumb when dealing with "to" questions

But my rule doesn't seem to work with "or"

Please clarify if my strategy is correct or not

Thanks