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E2
{=INDEX(A:A,SMALL(IF(N(MATCH($A$2:$A$30&($C$2:$C$30<50),$A$2:$A$30&($C$2:$C$30<50),)=ROW($1:$29))*($C$2:$C$30<50),ROW($2:$30),4^8),ROW(A1)))&""}
F2
=IF(E2="","",SUMPRODUCT(($A$2:$A$30=E2)*($C$2:$C$30<50)))

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