uniquePermutations -- produce all unique permutations of a list

• Usage:

  uniquePermutations x

• Inputs:
  • x, a visible list or an integer
• Outputs:
  • a list of all distinct permutations of the visible list x, or, if x is an integer, of the list of integers from 0 through n-1

i1 : uniquePermutations {a,b,a,b}

o1 = {{a, b, a, b}, {a, b, b, a}, {a, a, b, b}, {b, a, a, b}, {b, a, b, a},
     ------------------------------------------------------------------------
     {b, b, a, a}}

o1 : List