Heavenly Stems and Earthly Branches were ancient Chinese people to calculate the history, 12 Heavenly stems combined with 10 Earthly Branches has 60 combinations, like people often say "一甲子（yi jiǎ zǐ）", also called 60 years.
Heavenly Stem：
甲、乙、丙、丁、戊、己、庚、辛、壬、癸
Earthly Branches：
子、丑、寅、卯、辰、巳、午、未、申、酉、戌、亥
Five Elements：
金、木、水、火、土
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