map length (tiers :: [[ X Word4 ]])  =  [1,1,1,1,1,1,1,1,1,1,1,1,...]

length (list :: [ X Word4 ])  =  Infinity

allUnique (list :: [ X Word4 ])  =  True

ratioRepetitions (list :: [ X Word4 ])  =  0 % 1

tiers :: [X Word4]  =
  [ [0]
  , [1]
  , [2]
  , [15]
  , [3]
  , [4]
  , [14]
  , [5]
  , [6]
  , [13]
  , [7]
  , [8]
  , ...
  ]