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noble gas [noble gases]▼◼◼◼noun[UK: ˈnəʊb.l̩ ɡæs] [US: ˈnoʊb.l̩ ˈɡæs]
rare gas▼◼◼◻noun[UK: reə(r) ɡæs] [US: ˈrer ˈɡæs]
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