For example, I have the following:

```
A 2
B 3
C 1
A 2
A 3
B 2
D 1
```

I want to end up with this:

```
A 7
B 5
C 1
D 1
```

I tried to follow the example from Excel (https://www.youtube.com/watch?v=IGaq_biQ1B8) thinking it is the same, but all I would get is the same exact initial table just without the column values beyond the first entry. As in:

```
A 2
...3
...1
...2
...3
...2
...1
```

Appreciate any directives/suggestions.

Thanks,

T