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With this new novel I'm trying to write, I'm returning to a format of combining both first and third person perspectives, but via alternating chapters.

Technically, in the first person situation it is already done when the main character is observing others in the vicinity. Although the main perspective makes use of "I" and "me", when referencing others there has to be an employment of "he" and "she".

I'm simply taking it one step further by having two main characters where one has a first person POV and the other has a third person POV.

Something else I'm doing is using separate tenses. The first person perspective uses present tense while the third person perspective uses past tense. All of which is relevant to the plot.