# Find a list of list from a Matrix

Suppose I have a matrix say

```
L=[[1,2],[3, 4]]
M=matrix(L)
```

then after a few operations M is transformed in N say

```
N = matrix([[10,12],[33,14]])
```

how can I obtain the list `NN = [[10,12],[33,14]]`

.

If know that `N.coefficients() = N.list() = [10,12,33,14]`

but what I want is `[[10,12],[33,14]]`

.