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stratification [stratifications]▼◼◼◼noun[UK: ˌstræ.tɪ.fɪˈk.eɪʃ.n̩] [US: ˌstræ.tɪ.fɪˈk.eɪʃ.n̩]
layering▼◼◼◻noun[UK: ˈleɪər.ɪŋ] [US: ˈleɪər.ɪŋ]
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