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action▼noungeneric term
activity▼noungeneric term
cycle▼noun
natural action▼noungeneric term
natural process▼noungeneric term
periodic event▼noungeneric term
recurrent event▼noungeneric term
undulation▼noungeneric term
vibration▼noun
wave▼noungeneric term
El Nino▼noungeneric term
El Nino southern oscillation▼noun
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