Let's say the position looks like this:

```
[Title "Black to move"]
[FEN ""]

 1.d4 Nf6 2. c4 c5 dxc5

```

I usually do this:

```
[Title "Black to move"]
[FEN ""]

1.d4 Nf6 2. c4 c5 3. dxc5 e6 4. b4 a5

```

I have played this position only once, and won, but still this might repeat in a open tournament I might go soon, so I need help to figure this out, because in the videos I have seen for the Benoni, I can't really find this variation anywhere.