The Mystery Knit Cable Scarf 2025 uses the 1/1/1 RC (Right cross) in clue #5. It is much faster to learn to work this cable stitch without a cable needle.
The 1/1/1 RC with a cable needle instructions are as follows: Slip next 2 stitches to cable needle and place at back of work, k1, slip left-most stitch from cable needle to LH needle, move cable needle with remaining stitch to front of work, k1 from LH needle, then k1 from cable needle.
I have created a video to help you to learn how to work this 1/1/1 RC without a cable needle.