From the matrix M, how to find the cell of vectors Vi, indicating the index line of the value 2 in each column Ci ?

Example:

```
M=[1 0 2 0;
   0 2 2 1;
   2 1 0 2;
   2 1 2 0;
   0 2 1 1]

```

The expected output: `{[3 4],[2 5],[1 2 4],[3]}`