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Dec 25, 2019 at 17:18 vote accept Anthony
Dec 24, 2019 at 19:42 comment added Christophe @tosh In your approach when you want to eliminate some combinations such as CBXE. Her it goes further sine you could eliminate any combination such as AFCE that does not have its letters in the alphabetical order. You may make the combinatorial maths: how much possible combinations vs. how much combination that are alphabetically sorted.
Dec 24, 2019 at 18:55 comment added Anthony Do you mean that instead of checking each of CAFE, CAEF, CFAE, CFEA, CEAF, CEFA, ACFE, ACEF, AFCE, AFEC, AECF, AEFC, FCAE, FCEA, FACE, FAEC, FECA, FEAC, ECAF, ECFA, EACF, EAFC, EFCA, EFAC I can check just one ACEF? (I think it is) If so, then I steel didn't grasp, how should I eventually reach ACEF itself from all possibilites? Sorry if I speak vaguely.
Dec 23, 2019 at 0:03 history edited Christophe CC BY-SA 4.0
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Dec 22, 2019 at 23:49 history answered Christophe CC BY-SA 4.0