How many combinations are there in heavenly stems and earthly branches?

Tiangan: A, B, C, D, E, Ji, G, Xin, Ren and Gui.

Dizhi: Zi, Ugly, Yin, Mao, Chen, Si, Wu, Wei, Shen, You, Xu and Hai.

Take one day's stem and one place's branch in turn, and make a combination, 60 times as a cycle, that is, the ancient "one Jia Zi", that is:

Jia Zi, Yi Ugly, Bing Yin, Ding Mao, Chen Wu, Keith, Geng Wu, Xin Wei, Ren Shen, Gui You,

JOE, Yihai, Bingzi, Ding Chou, Wuyin, Jimao, Chen Geng, Xinsi, Renwu, Guiwei,

Shen Jia, Yiyou, Xu Bing, Dinghai, Wuzi, Ugly, Gengyin, Xinmao, Renchen, Guisi,

Wu Jia, Yiwei, Shen Bing, Ding You, Wuxu, Jihai, Gengzi, Xin Chou, Ren Yin, Gui Mao,

Chen Jia, Yi Si, Wu Bing, Ding Wei, Wu Shen, You You, Geng Xu, Xinhai, Ren Zi, Ghost Chip,

Jiayin, Yi Mao, Chen Bing, Ding Si, Wu Wu, Wei Wei, Geng Shen, Xin You, Ren Xu, Gui Hai.