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superfast▼(extremely fast)adjective[UK: ˈsuː.pərˌ.fæst] [US: ˈsuː.pər.ˌfæst]
superfast▼(at extremely high speed)adverb[UK: ˈsuː.pərˌ.fæst] [US: ˈsuː.pər.ˌfæst]
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