PPT Slide

0000

1000

0001

1100

1010

1001

0011

0101

1111

1110

1101

1011

0111

It is invalid because points 0010 and 0110 (which are already on the snake) are within one line length of each other.

0010

0100

0110

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Notes:

Could you exchange either 0010 or 0110 for another point to create a valid snake?