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'''This is used in [[Range extraction]] and [[Range expansion]].'''

A format for expressing an ordered list of integers is to use a comma separated list of either

  • individual integers
  • Or a range of integers denoted by the starting integer separated from the end integer in the range by a dash, '-'. (The range includes all integers in the interval including both endpoints) :* '''The range syntax is to be used only for, and for every range that expands to more than two values.'''


The list of integers: : -6, -3, -2, -1, 0, 1, 3, 4, 5, 7, 8, 9, 10, 11, 14, 15, 17, 18, 19, 20 Is accurately expressed by the range expression: : -6,-3-1,3-5,7-11,14,15,17-20 (And vice-versa).