I was shuffling around, hunting and weeding, when I grabbed a tuft of unwanted sprouts and yanked, and a clod of dirt came flying out with them. In the bald spot that clod left behind, I could make out what looked like a smooth, flat piece of stone. I picked at the edges and found more stone, and then more, and before long I was hacking at the backyard, trying to excavate this covert, stony path. 

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