// output of ./demo/comb/mset-kperm-lex-demo.cc:
// Description:
//% All k-permutations of a multiset in lexicographic order.

arg 1: 4 == plen  [length of prefix]  default=4
args: multiplicities of elements
multiplicities: ( 2, 2, 2 )  k=3  n=6
   1:  [ . . 1 1 ]  [ 2 2 ]   4
   2:  [ . . 1 2 ]  [ 1 2 ]   3
   3:  [ . . 2 1 ]  [ 1 2 ]   2
   4:  [ . . 2 2 ]  [ 1 1 ]   3
   5:  [ . 1 . 1 ]  [ 2 2 ]   1
   6:  [ . 1 . 2 ]  [ 1 2 ]   3
   7:  [ . 1 1 . ]  [ 2 2 ]   2
   8:  [ . 1 1 2 ]  [ . 2 ]   3
   9:  [ . 1 2 . ]  [ 1 2 ]   2
  10:  [ . 1 2 1 ]  [ . 2 ]   3
  11:  [ . 1 2 2 ]  [ . 1 ]   3
  12:  [ . 2 . 1 ]  [ 1 2 ]   1
  13:  [ . 2 . 2 ]  [ 1 1 ]   3
  14:  [ . 2 1 . ]  [ 1 2 ]   2
  15:  [ . 2 1 1 ]  [ . 2 ]   3
  16:  [ . 2 1 2 ]  [ . 1 ]   3
  17:  [ . 2 2 . ]  [ 1 1 ]   2
  18:  [ . 2 2 1 ]  [ . 1 ]   3
  19:  [ 1 . . 1 ]  [ 2 2 ]   0
  20:  [ 1 . . 2 ]  [ 1 2 ]   3
  21:  [ 1 . 1 . ]  [ 2 2 ]   2
  22:  [ 1 . 1 2 ]  [ . 2 ]   3
  23:  [ 1 . 2 . ]  [ 1 2 ]   2
  24:  [ 1 . 2 1 ]  [ . 2 ]   3
  25:  [ 1 . 2 2 ]  [ . 1 ]   3
  26:  [ 1 1 . . ]  [ 2 2 ]   1
  27:  [ 1 1 . 2 ]  [ . 2 ]   3
  28:  [ 1 1 2 . ]  [ . 2 ]   2
  29:  [ 1 1 2 2 ]  [ . . ]   3
  30:  [ 1 2 . . ]  [ 1 2 ]   1
  31:  [ 1 2 . 1 ]  [ . 2 ]   3
  32:  [ 1 2 . 2 ]  [ . 1 ]   3
  33:  [ 1 2 1 . ]  [ . 2 ]   2
  34:  [ 1 2 1 2 ]  [ . . ]   3
  35:  [ 1 2 2 . ]  [ . 1 ]   2
  36:  [ 1 2 2 1 ]  [ . . ]   3
  37:  [ 2 . . 1 ]  [ 1 2 ]   0
  38:  [ 2 . . 2 ]  [ 1 1 ]   3
  39:  [ 2 . 1 . ]  [ 1 2 ]   2
  40:  [ 2 . 1 1 ]  [ . 2 ]   3
  41:  [ 2 . 1 2 ]  [ . 1 ]   3
  42:  [ 2 . 2 . ]  [ 1 1 ]   2
  43:  [ 2 . 2 1 ]  [ . 1 ]   3
  44:  [ 2 1 . . ]  [ 1 2 ]   1
  45:  [ 2 1 . 1 ]  [ . 2 ]   3
  46:  [ 2 1 . 2 ]  [ . 1 ]   3
  47:  [ 2 1 1 . ]  [ . 2 ]   2
  48:  [ 2 1 1 2 ]  [ . . ]   3
  49:  [ 2 1 2 . ]  [ . 1 ]   2
  50:  [ 2 1 2 1 ]  [ . . ]   3
  51:  [ 2 2 . . ]  [ 1 1 ]   1
  52:  [ 2 2 . 1 ]  [ . 1 ]   3
  53:  [ 2 2 1 . ]  [ . 1 ]   2
  54:  [ 2 2 1 1 ]  [ . . ]   3
 ct=54