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This isn't actually crochet, it is knitting (the "invisible spool knitting technique" by Yoola) -- she calls it crochet because it uses a crochet hook, but the stitches themselves are knitting stitches. Anyway, this is a tip for speeding things up using two colours (or two spools of one colour) by doing two stitches on top of each other, one with one wire, one with the other. One would have to time it to see if it actually was faster, but I think it probably is, because it reduces the number of movements one has to make.