Table 2.

Combinations that follow the intrinsic rules of the historical systems, listed according to steps in the Chinese Clock.

1-step systems	= 2
1-step–3-step alternating systems	= 4
2-step systems	= 4
2-step–6-step alternating systems	= 4
3-step systems	= 2
5-step systems	= 2
6-step systems	= 1
Total number	19