first maps

@camsbury
In this kata my goal is to take a list of ints and return each int *2. It looks like I need to remove duplicates first. I was thinking of converting to a dict and then changing back to a list, as an internet example suggested, but wondered if you had another way
[1,1,3,3,7,8] should return [2,6,14,16]
```
def remove_duplicates(a):
  

def mapit(a):
    map(maps,a)
    ```