=IF(ISERROR(IF(AND(OR(MATCH(B12,A1:A5,0)=MATCH(D12,B1:B5,0),MATCH(C12,A1:A5,0)=MATCH(D12,B1:B5,0)),E14=8,VLOOKUP(E16,D1:E9,2,0)),"AC"&VLOOKUP(E16,D1:E9,2,0),"")),"",   IF(AND(OR(MATCH(B12,A1:A5,0)=MATCH(D12,B1:B5,0),MATCH(C12,A1:A5,0)=MATCH(D12,B1:B5,0)),E14=8,VLOOKUP(E16,D1:E9,2,0)),"AC"&VLOOKUP(E16,D1:E9,2,0),""))

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