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1. Remove or cut the 2 shortest string-lines. In this example they are shown in RED.
2. Use the longest 2 string-lines to guide your tiller in a straight line. shown in black
3. Till about 6 to 12 inches away from your string-lines so that you don't break them with the tiller.
4. When you complete your first tilling remove the remaining string-lines.
5. Leave the 4 corner markers in place as reference points.
6. Rake out roots and stones.