同字母 檢查均同一值 (13456)

F2{=2-(COUNT(0/((B$2:B$9=E2)*C$2:C$9=VLOOKUP(E2,B:C,2,)))=COUNTIF(B:B,E2))

另解=2-(SUMPRODUCT(N((B$2:B$9=E2)*C$2:C$9=VLOOKUP(E2,B:C,2,)))=COUNTIF(B:B,E2))



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