Things to do:

1.  Compare results to other computer.

2.  khanexercises.appspot.com

Test...

Results of "L":

Bad ones:	26
Good ones:	353
Unknown:	5537

After ib, ji, cj:

cf
	eh (0)
		cd dg ad af !
		id he di gb !
fc
	de (2)
		hi
		ih
			he (3)
				hc
				id
				hi
					gf (3)
						dc
						di
						hc fe (8) -- candidate for direct checking
						ad ed !
				gb
					fe (0)
						hi gf !
						da !
			je (4)
				if
				dc
				di
				hi
					eh (8)	-- candidate for direct checking
		if he !
		hc ed be fa !
		dc ha di gh ef fa !
	he (5)
if
	gd (5)
		fi
		di
		ih
		id
		ch
			dg(3)
	he (6)
fi
	hg (4)
		hi
		di
		dc
		cd

