PPT Slide
0000
1000
0001
1100
1010
1001
0011
0101
1111
1110
1101
1011
0111
Actually, there are two problems here. The point 1010 is adjacent to both 0010 and 1011 which are part of the snake.
0010
0100
0110
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Notes:
Many snakes of the right length will have multiple violations of the valid snake rule.