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extension▼◼◼◼[UK: ɪk.ˈsten.ʃn̩] [US: ɪk.ˈsten.ʃn̩]
stretch▼◼◼◻[UK: stretʃ] [US: ˈstretʃ]
stretching▼◼◻◻[UK: ˈstretʃ.ɪŋ] [US: ˈstretʃ.ɪŋ]
time dilation▼◼◼◼
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