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Turning chain-2 does not count as a stitch.
Two coasters may have the same number of stitches but still turn out different in size, even
when using the same hook. This happens because the yarn thickness varies. If you want all
your coasters to be the same size, make sure to use the same type of yarn for each one.
The key to successful colorful coasters is learning how to change colors properly, as explained
below.
Use the reference images provided.