I have an array of arrays something like `arr[26,20]` with the alphabet in the first position of each array.

So laid out in matrix form it would something like.

* ABCDEFGHIJKLMNOPQRSTUVWXYZ
* //////////////////////////
* //////////////////////////
* //////////////////////////
* //////////////////////////

The forward slashes representing null values.

I'm trying to get the number of non null elements in a single colomn.

So the code I could use on a normal array would be

```
int number = arr[0].Count(s => s != null);

```

However, how would I do this for a matrix like described?