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cornerstone [cornerstones]▼◼◼◼noun[UK: ˈkɔː.nə.stəʊn] [US: ˈkɔːr.nərˌstoʊn]
keystone [keystones]▼◼◼◻noun[UK: ˈkiː.stəʊn] [US: ˈkiːˌstoʊn]
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