well-founded set
美
[ˈwɛlˈfaʊndɪd sɛt]
英
[ˈwelˈfaʊndɪd set]
良基集
Examples
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美[ˈwɛlˈfaʊndɪd sɛt]英[ˈwelˈfaʊndɪd set]
良基集