2x1

(a)  

2x3

(a)  

2x4

(a)  

2x5

(a)  

2x6

(a)  

2x7

(a)  

2x8

(a)  

2x9

(a)  

2x10

(a)  

2x11

(a)  

2x12

(a)  

2x25

(a)  

2x50

(a)  

4x1

(a)  

4x2

(a)  

4x3

(a)  

4x4

(a)  

4x5

(a)  

4x6

(a)  

4x7

(a)  

4x8

(a)  

4x9

(a)  

4x10

(a)  

4x11

(a)  

4x12

(a)  

4x100

(a)  

4x50

(a)