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gruelling▼(so difficult or taxing as to make one exhausted)adjective[UK: ˈɡruːəl.ɪŋ] [US: ˈɡruːəl.ɪŋ]
strenuous▼(requiring great exertion)adjective[UK: ˈstre.njʊəs] [US: ˈstre.njuːəs]
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