I have a dictionary with varying numbers of elements. e.g.: 

```
data = {"Tr1":[1,2,3], "Tr2": [4,5,6], "Tr3": [7,8,9]}

```

I would like to extract all values from the dictionary, and write it to a new separate list. e.g.: 

```
outputData = [1,2,3,4,5,6,7,8,9]

```

Thanks in advance!