Initializing an associative array into a variable when it is created

[Alexander Zhirov via Digitalmars-d-learn]

I still don't understand how to make this entry correct. I have a 
static array that I want to use exactly as an array (the 
structure doesn't quite fit):

```d
string[][string] arr = [
    "one": ["abc", "def"],
    "two": ["ghi", "jkl"],
    "three": ["mno", "pqr"]
]
```
There are the same number of elements everywhere (in the internal 
array).