How to sew a flat piece to a closed piece

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1. insert the needle to the first stitch and       bring the needle up below the next           stitch in the closed piece and yarn             through.

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3. Go back to the same hole where the        yarn emerge out in the closed piece          and draw the yarn tight.

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2. Insert the needle under both loops in        the flat piece together and yarn                  through.

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4. Repeat across the top of the flat piece.

Video Tutorial