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crown [crowns]▼(highest part of an arch)noun[UK: kraʊn] [US: ˈkraʊn]
keystone [keystones]▼(the top stone of an arch)noun[UK: ˈkiː.stəʊn] [US: ˈkiːˌstoʊn]
open sesame▼(successful means of achieving a result)noun
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