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You could focus on one part of the F, or just one point. Where that will be on the grid once you have flipped the F? Can you build up a picture of the F after the flip in this way?
You might like to have some dotty paper to hand to draw the F after you've talked to someone else about it.
You could draw the grid and the F on an overhead transparency, then flip it to check what you have pictured in your head.