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• To select elements from embedded lists, it could be better to use chained selection.
  If, say: lst <- list('a' = list('a1' = 11, 'a2' = 12), 'b' = list('b1' = 21, 'b2' = 22))
  then: lst[['a']][['a2']] == lst[[c('a', 'a2')]]

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