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	Kenneth Beck

The Kakuro solver is divided into two sections. The first section, Kakuro.lhs, 
provides the backtracking algorithm used for solving a Kakuro puzzle. There are
four functions:

choices - Produces a list of valid moves for the next element in the Kakuro grid
choose  - Selects the provided move and returns a new board with the selection
solved  - Returns true if there are no more moves to be made on the board
solve   - Runs the solving algorithm on a board, and returns the solution
          or an empty list if no solutions exist.
The other section is KakuroHelper. This contains all the helper functions
used for the Kakuro solver. It also contains several sample Sudoku grids
that can be used to test the algorithm. To run the solver over a grid,
pass the grid into the solve function:

solve sample5x51

To help with visualising the Kakuro grid, I've provided an html file that can
both accept the Haskell representation of the grid and generate a new grid that
can be passed back into the Haskell solver. 

After launching Kakuro.htm in a web browser, you are presented with a simple
interface. Across the top are three buttons:

Clear Grid   - Clears the current grid, converting all cells to Empty cells.
Clear Values - Removes all values from non-helper cells.
Get/Paste Grid String - Presents a prompt that displays the Haskell string
	representation for the current grid. This can be copied and then run
	against the Kakuro solver. Or, a grid generated from the solver can be
	pasted into the prompt and the HTML page will update its grid to represent
	the Haskell one.

The second row contains dropdowns for manipulating the layout of the grid. The
first dropdown contains the values 4 through 15, and allows a user to generate
a square grid of any dimension between those values. The second dropdown 
determines the on-click behavior of the cells:

Change Cell Type - clicking on a cell toggles between the three cell types:
   - Empty cell, represented by a solid-grey box
   - Helper cell, represented by a grey box with a diagonal-black line
   - Normal cell, represented by a solid-white box
   NOTE: Changing a cell type will remove all values the cell may contain
Change Cell Value - for helper and normal cells, provides a prompt that allows
	the user to change the values of the cell.
	For normal cells, the user selects one number to represent the value of that
	For helper cells, the user first selects the sum to be displayed in the
	horizontal direction (or 0 if no sum should be displayed) and then selects
	the sum to be displayed in the vertical direction (or 0 if no sum should
	be displayed).
A couple notes:
The web page does not save state. If the page is refreshed for whatever reason
the board will be cleared. Thus, it's a good idea to keep a copy of your 
grid string whenever possible.

The board does some basic error checking for the input string (verifying that
the string is valid solver-input), but beyond that, it does not determine if
moves are valid or if a grid is actually solved. It is used for generating
grids and displaying solutions, nothing more.