Original

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Final outcome

First I cropped my image to the size I wanted then I copied the image by pressing control A then going into edit and copy, after increasing the canvas to the right by going into image, canvas size then pressing the left middle arrow and changing the width size to 31. I pasted the image and flipped the image horizontally by going onto image, image rotation and flip image horizontal and flattened the two images together by pressing the four horizontal lines where the layers are and then pressing flatten image. I repeated the process but flipping the image vertically.