Basefinder?
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It did not work accurately so it was removed
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I found something there was many variations but not looks can be functional as well because xray can be also enough to find base because chest and blocks so its ok. Basefinder was probably has some more specific about lines and that stuff. Thing is that make sense.
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It was basically like BlockESP except it would highlight things that it determined to be bases or had base-like structure, but it was mostly inaccurate. Either xray, blockesp or tracers would be better for finding bases