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keystone [keystones]▼◼◼◼(something on which other things depend for support)noun[UK: ˈkiː.stəʊn] [US: ˈkiːˌstoʊn]
keystone [keystones]▼◼◼◼(the top stone of an arch)noun[UK: ˈkiː.stəʊn] [US: ˈkiːˌstoʊn]
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