The composition of 1 and 2: 2 can be divided into 1 and 1, 1 and 1 composition 2.
Composition of 2 and 3: 3 can be divided into 1 and 2, 1 and 2 to form 3.
Composition of 3 and 4: 4 can be divided into 1 and 3, 2 and 2, 1 and 3 to form 4.
Composition of 4 and 5: 5 can be divided into 1 and 4, 2 and 3, 3 and 2, 4 and 1, 1 and 4 to form 5.
Composition of 5 and 6: 6 can be divided into 1 and 5, 2 and 4, 3 and 3, 4 and 2, 5 and 1, 1 and 5 to form 6.
The composition of 6,7: 7 can be divided into 1 and 6,2 and 5,3 and 4,4 and 3,5 and 2,6 and 1, 1 and 6 to form 7.
Composition of 7 and 8: 8 can be divided into 1 and 7, 2 and 6, 3 and 5, 4 and 4, 5 and 3, 6 and 2, 7 and 1, 1 and 7 to form 8.
Composition of 8 and 9: 9 can be divided into 1 and 8, 2 and 7, 3 and 6, 4 and 5, 5 and 4, 6 and 3, 7 and 2, 8 and 1, 1 and 8 to form 9.