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This is the entrelac or tunisian entrelac crochet stitch pattern. It forms a patchwork of diamonds that are all connected together as you go. You just use a regular crochet hook - you won't need any special tunisian or afghan hook. A few colors of worsted medium weight yarn and a size H 5 mm crochet hook work great!Source : https://www.youtube.com/watch?v=pfj-bxfIMf8