How to knit in the round using two circular needles
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How to Cable 4 Front (C4F)
Another version of the cable instruction could have a different number (like C6F) in which case you'd slip 3 stitches to the cable needle and then knit the next 3 stitches.
How to Tink (unknit)
Always insert your left hand needle (LHN) from front to back of the previous stitch when tinking. It doesn't matter if it was a knit or a purl you always insert the needle in this direction.