7 x 6

(a)  

6 x 5

(a)  

4 x 3

(a)  

2 x 1

(a)  

1 x 1

(a)  

9 x 0

(a)  

9 x 9

(a)  

8 x 8

(a)  

7 x 7

(a)  

6 x 6

(a)  

5 x 5

(a)  

4 x 4

(a)  

89 x 90

(a)  

2 x 2

(a)  

67 x 78

(a)  

78 x 89

(a)  

56 x 67

(a)  

45 x 56

(a)  

34 x 45

(a)  

23 x 34

(a)  

12 x 23

(a)