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intractable▼◼◼◼(mathematics: not able to be solved)adjective[UK: ˌɪn.ˈtræk.təb.l̩] [US: ˌɪn.ˈtræk.təb.l̩]
insolvable▼◼◻◻(impossible to solve)adjective[UK: ɪnsˈɒlvəbəl] [US: ɪnsˈɑːlvəbəl]
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