Excuse me, what is the word of this bottom payment?

Question: What's the word for this bottom payment?

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Interpretation of Cao Wanfen's system

Explain the seal script; Read vertically from the right.

Author Cao Wanfen: 1940 Born in Yixing, Jiangsu Province, Zisha pot artist, senior arts and crafts artist, member of China Arts and Crafts Society, and member of Yixing Zisha Culture and Art Research Committee. The work is exquisite and elegant. (See Baidu Encyclopedia entry)

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