7	8	9
4	5	6
1	2	3
delete		0

corner 7	corner 8	corner 9
corner 4	corner 5	corner 6
corner 1	corner 2	corner 3
delete		corner 0

centre7	8	9
4	5	6
1	2	3
delete		0

colour 7	8	9
4	5	6
1	2	3
delete		0