// output of ./demo/perm/permrand-sdc-demo.cc:
// Description:
//% Random permutations with prescribed Sets into Distinct Cycles

arg 1: 5 == n  [Number of elements.]  default=5
arg 2: 15 == rep  [This many permutations.]  default=15
args 3,4,... : [Supply at least on number >=1]
 cn=1
   f=[ 3 2 4 1 0 ]   (3, 2, 4, 1, 0)     
   f=[ 4 2 1 0 3 ]   (4, 2, 1, 0) (3)    
   f=[ 3 2 1 0 4 ]   (3, 2, 1, 0) (4)    
   f=[ 4 1 3 0 2 ]   (4, 1, 3, 0) (2)    
   f=[ 1 2 0 3 4 ]   (1, 2, 0) (3) (4)   
   f=[ 3 4 2 1 0 ]   (3, 4, 2, 1, 0)     
   f=[ 2 3 1 4 0 ]   (2, 3, 1, 4, 0)     
   f=[ 3 1 2 0 4 ]   (3, 1, 2, 0) (4)    
   f=[ 2 4 3 1 0 ]   (2, 4, 3, 1, 0)     
   f=[ 1 3 2 4 0 ]   (1, 3, 2, 4, 0)     
   f=[ 4 2 3 1 0 ]   (4, 2, 3, 1, 0)     
   f=[ 1 0 4 2 3 ]   (1, 0) (4, 2) (3)   
   f=[ 4 2 3 1 0 ]   (4, 2, 3, 1, 0)     
   f=[ 1 4 3 2 0 ]   (1, 4, 3, 2, 0)     
   f=[ 1 4 0 3 2 ]   (1, 4, 0) (3, 2)