⍝ Kaprekar's operation:

    ↑⍕∘k6174¨⍳20                    ⍝ first 20 Kaprekar sequences.
1 999 8991 8082 8532 6174            
2 1998 8082 8532 6174                
3 2997 7173 6354 3087 8352 6174      
4 3996 6264 4176 6174                
5 4995 5355 1998 8082 8532 6174      
6 5994 5355 1998 8082 8532 6174      
7 6993 6264 4176 6174                
8 7992 7173 6354 3087 8352 6174      
9 8991 8082 8532 6174                
10 999 8991 8082 8532 6174           
11 1089 9621 8352 6174               
12 2088 8532 6174                    
13 3087 8352 6174                    
14 4086 8172 7443 3996 6264 4176 6174
15 5085 7992 7173 6354 3087 8352 6174
16 6084 8172 7443 3996 6264 4176 6174
17 7083 8352 6174                    
18 8082 8532 6174                    
19 9081 9621 8352 6174               
20 1998 8082 8532 6174               

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