1-1到1-6

1-6到1-10

1-11到1-15

1-16到1-21

2-1到2-5

2-6到2-10

2-11到2-15

2-16到2-21

3-1到3-5

3-6到3-10

3-11到3-15

3-16到3-21

4-1到4-5

4-6到4-10

4-11到4-15

4-16到4-21

5-1到5-5

5-6到5-10

5-11到5-15

5-16到5-21