There is a two-dimensional array:

```
l = [[2], [3], [4], [5]]
```

How to write it in this form?:

```
l = [2, 3, 4, 5]
```

## Answer 1

Here is an example code:

```
l = [elem [0] for elem in l]
```

If there is more than 1 element in the attached list:

```
answer = []
For i in L:
Answer.APPEND (I)
```

## Answer 2, Authority 400%

With any number of elements in the second dimension

```
[a for b in l for a in b]
```

## Answer 3, Authority 200%

```
matrix = [[1, 2, 3, 4],
[5, 6, 7, 8],
[9, 10, 11, 12],
[13, 14, 15, 16]]
Print (SUM (Matrix, []))
```

# pin

```
[1, 2nd, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 13, 14, 15, 16]
```

## Answer 4

Conversion of a two-dimensional array into one-dimensional:

```
arr = [[2, 0, 0], [3, 0, 9], [4, 7, 6], [5, 1, 3]]
X = Len (Arr [0])
Y = Len (ARR)
LST = []
For i in Range (Y):
For j in arr [i]:
LST.APPEND (J)
lst
```

Conclusion:

```
[2, 0, 0, 3, 0, 9, 4, 7, 6, 5, 1, 3 ]
```