The July files in this directory are taken from the online Sudoku Experience activity.

The November files are associated with a revision to a desktop model.

The local versions of the files 1_..., 2_..., 3_... are modified to eliminate
spurious dependence on the strings used to display digits in the sudoku grid.
The conditions a1=="" and a1!="" used in 2_... and 3_... have been edited to
the form a_1==0 and a_1!=0 etc. This improves the definitions of the
observables possdigit11 and cntposs11. The runme.txt and runmeGP.txt have
been adapted to reflect this.
