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black swan▼(something believed non-existent)noun[UK: blæk swɒn] [US: ˈblæk ˈswɑːn]
rara avis [rarae aves]▼(rare or unique, and thus outstanding or unusual, person or thing)noun[UK: ˈrɑː.rə.ˈæ.vɪs] [US: ˈrɑː.rə.ˈæ.vɪs]
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