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acceleration▼◼◼◼[UK: ək.ˌse.lə.ˈreɪʃ.n̩] [US: ˌæk.ˌse.lə.ˈreɪʃ.n̩]
speeding up▼◼◻◻[UK: ˈspiːd.ɪŋ ʌp] [US: ˈspiːd.ɪŋ ʌp]
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