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sturdiness▼(the state or quality of being sturdy)noun[UK: ˈstɜː.dɪ.nəs] [US: ˈstɝː.di.nəs]
robustness [robustnesses]▼(quality of being robust)noun[UK: rəʊ.ˈbʌst.nəs] [US: roʊ.ˈbʌst.nəs]
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