2-1=□ 3-1=□ 3-2=□ 4-1=□ 4-2=□ 4-3=□
5 5 5 5
6 6
5-1=□ 5-2=□ 5-3=□ 5-4=□ 6-1=□ 6-2=□6 6 6 7 7 7
6-3=□ 6-4=□ 6-5=□ 7-1=□ 7-2=□ 7-3=□7 7 7 8 8 8
7-4=□ 7-5=□ 7-6=□ 8-1=□ 8-2=□ 8-3=□8 8 8 8 9 9
8-4=□ 8-5=□ 8-6=□ 8-7=□ 9-1=□ 9-2=□
9-3=□ 9-4=□ 9-5=□ 9-6=□ 9-7=□ 9-8=□
10 10 10 10
10-1=□ 10-2=□ 10-3=□ 10-4=□
10 10 10 10
10-5=□ 10-6=□ 10-7=□ 10-8=□
10
10-9=□