Fill
in the matrix so that every row, every column, and every 3x3 box, contains the
numbers 1 through 9. This also means that no repetition of numbers is
allowed in each column, row, or 3X3 box.
To explain all nature is too difficult a task
for any one man or even for any one age. `Tis much better to do a little
with certainty, and leave the rest for others that come after you, than to
explain all things.