multiple keys for a map in C++

I have a table where the entries are something like this ``` Row - Column1 - Column2 - Column3 Column4 1 0X0A 1 2 A 2 0X0B 2 2 B 3 0x0C 3 2 C ``` Now i want to use map in such that i can use column 1 or Column 2 as the key to get the row. What kind of map i should use to achieve this? (Note- Table is just for explanation and not the exact requirement) I thought of using multimap, but that is not going to solve the prob