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Chain 2 in beginning of rounds do not count as a stitch
When counting edges, do not count that Chain 2 in the beginning of the round – it does not count as a stitch.
I have also provided some photos of some of the steps to making this granny square to help with stitch counts: (click individual photos for larger view)
A question you may have is – to block or not to block the squares? I would say it’s a personal preference. I personally do not block my squares and once I join them together, they usually all lay together well. If anything, I may block the border once the afghan is all finished.