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tremble [trembled, trembling, trembles]▼verb[UK: ˈtrem.bl̩] [US: ˈtrem.bl̩]
undulate [undulated, undulating, undulates]▼verb[UK: ˈʌn.djʊ.leɪt] [US: ˈʌn.dʒə.ˌlet]
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