perm Permutations in Sn
 
 for example, sigma=perm({[1 24 20],[2 14 9],[3 11 13],[4 18 23],[5 21 17],[6 7 10],[8 16 12],[15 19 22]});
 
 perm Properties:
    list - the permutation as a list of the outputs from inputs 1,..,n
    cycles - the permutation as a cell array of vectors representing
        cycles
    n - the size of the set the permutation acts on
    numCycles - the number of cycles in the permutation
 
 perm Methods:
    perm - construct a permutation object given a permutation in list or cycle
        form
    char - output permutation as string of cycles
    disp - display permutation as string of cycles
    mtimes - multiply permutations left to right
    mpower - raise permutation to integer power
    action - act permutation on element of {1,..,n}
    subsref - act permutation on element of {1,..,n} using function
        notation
    end - used for last index in list