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colored aqua. It fits easily - it looks stylish!
When tied the desired length of the scarf, close the last row. Grip 3 loops with knitting needles and knit the first fringe element to the desired length. Then skip 3 loops. Raise 3 again and tie 2 fringe elements and so on until the end. And then do the same on the other side of the scarf.
Option is simpler: to attach an ordinary fringe.