User blog comment:Alemagno12/DAN is weaker than R function/@comment-11227630-20170827073324/@comment-25601061-20170827134757

But {1,,,1{1,,,1,,,2}2} is 1-separator of {1,,,__}, not {1{1,,,1{1,,,1,,,2}2}2}, making DAN weaker than R function.