#### Merge 2D Array into Single Array

You are given a two dimensional array containing arrays of integers as an argument. Return a single array containing all of the integers from all of the arrays, maintaining the original ordering.

### Requirements

- Must return a single array of integers

#### Example #1

```
solve([[1,2],[3],[4,5,6]])
> [1,2,3,4,5,6]
```

#### Example #2

```
solve([[5,6],[3,4],[7,2]])
> [5,6,3,4,7,2]
```