well they usually wear out by then. but anyway we dont mark the sets. how can i say it
hmm
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it looks kinda like that ^ accept the whole field. say you start on the hash marks theres a dot on a yard line then in the middle of two then on another etch each 4 steps away
like i said we work around the dots your 1 step in front of that one 2 diagonal from that one half a step behind that one etc