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rocket science▼(anything overly complex (idiomatic))noun[UK: ˈrɒkɪt ˈsaɪəns] [US: ˈrɑːkət ˈsaɪəns]
hydra [hydras]▼(complex, multifarious problem)noun[UK: ˈhaɪ.drə] [US: ˈhaɪ.drə]
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