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Knit into front and back of a stitch is a single or a multiple stitch increase. It creates a purl like bump, doesn't have a lean and is fairly noticeable.

To make this increase, insert the right hand needle into a stitch and knit through the front loop without sliding the worked stitch off the left hand needle, twist the right hand needle and knit through the back loop, perform these two actions until you have increased by a desirable number of stitches, slide the worked stitch off the left hand needle.

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