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trial [trials]▼◼◼◼noun[UK: ˈtraɪəl] [US: ˈtraɪəl]
proving [provings]▼◼◻◻noun[UK: ˈpruːv.ɪŋ] [US: ˈpruːv.ɪŋ]
research and test phase▼noun
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