It is inevitable that the stockinette will curl. I will explain why this happens from a structural standpoint.
The stockinette curls in two directions. Vertically it curls toward the front and horizontally it curls toward the back.
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( 0:24~ )
The reason it curls toward the front side is because of a series of structures that pull loops out from within loops.
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( 0:34~ )
In Garter Stitch, Rib Stitch, and Moss Stitch, knit stitches and purl stitches alternate in a row, and the rounding forces cancel each other out.
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( 1:53~ )
