Flows are like if-and-then-else, if-and-and-then-else if-and-or-then-else, if-and-or-or-then-else, if-and-and-or-and-and-then-else and variations to that.
However, if-or-then is not possible.
Not sure how many And or Or you can add to a flow.
But, fresh from the community store, there is a flow editor extension which adds almost endless possibilities to flow creating.