Sequence of files for loading

donaldgridsqs.e
	- sets up the squares for the line drawing version of Sudoku
	- there is a bug in this, whereby the square 64 is misplaced

donaldgridlines.e
	- inserts the grid lines
	- this file illustrates some experiments in using colour / width etc

donaldgridselect.e
	- allows squares to be selected by the mouse
	- shows the development of a simple proc

addslide13.e
	- adds a presentation slide, that doubles as an interface
	
puzzle1bug1.e
	- addresses the first bug encountered in the model
	- it leads to the redefinition of lron, the criterion for a LR line to be highlighted
	- illustrates approach to debugging using dependency

puzzle1bug2.e
	- addresses the second bug encountered in the model
	- it leads to the redefinition of the "location" of a square in the line drawing grid
	- this resolves a discrepancy between the display of puzzle 1 in the two grids

endsolvepuzzle1.e
	- completes the solution of puzzle 1, but for the insertion of a single value
	
setupsolvepuzzle5.e
	- loads puzzle 5 and introduces configuring of the line drawing grid to reflect a digit in mind

solvepuzzle5.e
	- traces the steps in the solution of puzzle 5
	- incorporates inappropriate mouseclicks on line drawing grid that break dependencies
	- ... that are then restored by reintroducing the select digit in mind mechanism
	- also includes steps that are hard to explain from the trace alone!