A B
1 Roger =IF(COUNTIF(A$1:A1,A1)=1,1,0)
2 Imee =IF(COUNTIF(A$1:A2,A2)=1,1,0)
3 Ruth =IF(COUNTIF(A$1:A3,A3)=1,1,0)
4 Roger =IF(COUNTIF(A$1:A4,A4)=1,1,0)
5 Imee =IF(COUNTIF(A$1:A5,A5)=1,1,0)
6 Imee =IF(COUNTIF(A$1:A6,A6)=1,1,0)
7 Merly =IF(COUNTIF(A$1:A7,A7)=1,1,0)...