4 | `CompleteSeparable of string
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5 | `CompleteUnseparable of string
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10 `Complete | `Uncomplete
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12 | `Separable of (int * Num.nf) list
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13 | `Unseparable of string
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16 val problem_of: div:(string option) -> conv:string list -> nums:string list -> problem * response
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17 val solve: problem * response -> result
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