0 : {}
 1 : {1,12,123,1234}
 2 : {2,21,23,234}
 3 : {3,32,34,321}
 4 : {4,43,432,4321}
 5 : {13,132,134,1324,13243}
 6 : {14,124,143,1243,1432}
 7 : {24,214,243,2143,21432}
 8 : {121,1213,12132,12134,121324,1213243}
 9 : {213,2132,2134,21324,213243}
10 : {232,2321,2324,21321,23214,23243}
11 : {324,3214,3243,32143,321432}
12 : {343,3432,32432,34321,324321,3214321}
13 : {1214,12143,121343,121432,1213432}
14 : {1232,1321,12321,12324,123214,123243}
15 : {1343,13432,132432,134321,1324321}
16 : {2343,2432,23432,24321,214321,234321}
17 : {12343,12432,14321,123432,124321,1234321}
18 : {13214,132143,1232143,1321432,12321432}
19 : {21343,213432,2132432,2134321,21324321}
20 : {121321,1213214,12132143,121321432}
21 : {213214,232143,2132143,2321432,21321432}
22 : {232432,2324321,23214321,213214321}
23 : {1214321,12132432,12134321,121324321}
24 : {1232432,12324321,13214321,123214321}
25 : {1213214321}