NO
NO
NO
NO
YES
1 2 3 4 
2 1 4 3 
NO
NO
YES
1 3 2 4 5 
2 1 3 5 4 
YES
1 2 
1 2 
NO
YES
1 2 3 4 
2 1 4 3 
NO
YES
2 1 3 
1 3 2 
NO
YES
1 3 2 4 5 6 7 
2 1 3 5 4 7 6 
NO
NO
NO
YES
1 3 2 4 5 
2 1 3 5 4 
NO
NO
NO
YES
2 1 3 4 
1 3 2 4 
NO
YES
2 1 3 
1 3 2 
YES
1 3 2 4 
2 1 3 4 
NO
YES
1 3 2 4 6 5 
2 1 3 5 4 6 
NO
NO
NO
NO
NO
YES
2 1 3 4 5 
1 3 2 5 4 
NO
YES
1 2 3 4 
2 1 3 4 
YES
1 2 3 
1 2 3 
NO
NO
NO
YES
1 2 3 4 5 6 7 8 
2 1 4 3 6 5 8 7 
NO
NO
YES
1 2 3 4 5 6 
2 1 4 3 6 5 
NO
YES
2 1 3 5 4 6 
1 3 2 4 6 5 
NO
NO
NO
YES
2 1 3 4 5 
1 3 2 5 4 
NO
YES
1 2 
2 1 
YES
1 
1 
NO
YES
1 2 3 4 
1 2 3 4 
NO
NO
YES
1 2 
2 1 
NO
NO
NO
NO
YES
1 2 3 4 
2 1 4 3 
NO
YES
2 1 3 4 5 6 7 
1 3 2 5 4 7 6 
YES
1 2 3 
2 1 3 
NO
YES
1 2 3 4 5 6 
2 1 4 3 6 5 
NO
YES
1 3 2 
2 1 3 
NO
NO
NO
YES
1 3 2 
2 1 3