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The WP article is pretty good, but SE is meant to be standalone, so I'll try to give my interpretation of the American system, the Yosemite Decimal System. This system is for free climbing (mountai...
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The WP article is pretty good, but SE is meant to be standalone, so I'll try to give my interpretation of the American system, the Yosemite Decimal System. This system is for free climbing (mountai...