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This is a filet crochet pattern, where the design is made up by making chain-space stitches. Because of this, the easiest way to demonstrate this pattern is using a chart.
Free Pattern Flower Square in Filet Designs for Crochet Royal Society Book 36 1934 http://web.archive.org/web/20071231193623/http:/www.angelfire.com/folk/celtwich/
35 Modern Ideas for Crochet Designs, Latest Trends in Decorating