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cornerstone [cornerstones]▼(base stone)noun[UK: ˈkɔː.nə.stəʊn] [US: ˈkɔːr.nərˌstoʊn]
foundation stone▼(stone laid during construction)noun[UK: faʊn.ˈdeɪʃ.n̩ stəʊn] [US: faʊn.ˈdeɪʃ.n̩ ˈstoʊn]
keystone [keystones]▼(something on which other things depend for support)noun[UK: ˈkiː.stəʊn] [US: ˈkiːˌstoʊn]
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