J
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Jan Češpivo
  1. it should be possible to set grading easily
  2. grades in a gym change sometimes during the year
  3. grades in multiple gyms are not directly comparable even they look the same (like fb grades)
  4. grades in gyms are not directly comparable to outdoor grades
  5. grades in gyms might be comparable in one moment only according to the ability of more climbers to climb them (statistics)