What's the number of the maid Niu Gengdi?

It should be: 6. Niu Gengdi has reclaimed boundless land and gained a lot. The following is the explanation of hexagrams in the computer:

6. This number does not refer to six cows in this constellation, but refers to six times, meaning more than six years, or six months or six months. Rice fields in the south are operated in double seasons, and ploughing and copying are carried out in one year. Rake, roll, and even use cattle more than six times. It is also correct for us to divide the six operations into a multi-level and multi-level cooperation system and understand it as a joint operation mode. It is quite satisfactory to open up the career ending by collective joint efforts. Individual pots are full, collective profits are rich, and the harvest is more than enough. Therefore, the signature of the poem warns you not to do it alone, but to rely on everyone's strength. The core strength of this undertaking consists of six people, including yourself. Six people working together in Qi Xin will surely achieve great success. If you have it collectively, you will have it. "The big river rises and the small river is full." Sixth, it is an auspicious number, which often symbolizes everything is smooth, safe and prosperous!