Leaders and enders are the scraps you sew together while you are making 'another' quilt.. its 2 sqs you sew so that you have something on your machine and not a loose tail for the next block..
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Here i sewed 2x2 scraps... turned them into 4 patches and eventually i think 16 patches.. all from sewing the 2x2 as leaders and enders when my leaders and enders box got full..