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Snakes

In the diagram a number of snakes of equal length is positioned. Every snake has a head and a tail and a variable number of segments inbetween. Next to the diagram is stated how many snakes there are and what their length is. The numbers below and next to the puzzle indicate how many squares in those columns and on those rows are occupied. Snakes never touch each other and themselves, not even diagonally. Squares occupied by the same snake only touch horizontally or vertically if the snake crosses the border they share. Sometimes it is not clear what is the head and what is the tail, but that doesn't matter as long as it is clear where the snake is. They avoid large leaves, but irresistable clovers will always end up in the body of a snake.

Example

In this small puzzle we are looking for a snake with a length of 11 squares, head and tail included. The 4 next to the top row indicates this row is completely occupied by the snake. Because the pieces of snake can only touch each other horizontally or vertically when the snake crawls through the border they share, we now know where the first five pieces of the snake are.

The 6th segment of snake can now only be in one place: below the upper right corner. The segment after that has to be directly below that one; not only because the second row is already filled as far as it should be, but also because the square to the left of it vertically touches the 4th snake segment while the snake is not crawling through the border they share. The rightmost column is now also complete. With the right mouse button we can put a leaf in the bottom right corner to indicate it will remain empty.

Again there is only one way the snake can proceed: to the left, after which also the third row is complete. Clearly, now there is only one way to connect the head to the tail.


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