Suppose I have a dataframe as such:

```
   Var0  Var1
0    11    22      <--------- Get 1st element of matching
1    11    84
2     8    36      <--------- Get 1st element of matching
3     8     8
4     8    10
5     6    12      <--------- Get 1st element of matching

```

I want to get this result:

```
   Var0  Var1
0    11    22
2     8    36
5     6    12

```

First I sort my dataframe by `sort_values()`:

```
df.sort_values(['Var0'], ascending=['False'])

```

I think im suppose to use `set` but not sure where to do it. 
I do not want to iterate through the dataframe due to speed.