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ensure [ensured, ensuring, ensures]▼(make sure or certain)verb[UK: ɪn.ˈʃʊə(r)] [US: en.ˈʃʊr]
make sure▼(to verify)verb[UK: ˈmeɪk ʃʊə(r)] [US: ˈmeɪk ˈʃʊr]
ascertain [ascertained, ascertaining, ascertains]▼(find out; discover or establish)verb[UK: ˌæ.sə.ˈteɪn] [US: ˌæ.sər.ˈteɪn]
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