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Create a range grid

This challenge is based on the `i.` verb from J. 

A range grid is basically a range of `m × n` numbers fit into a rectangular grid with `m` rows and `n` columns.

A `2×3` range grid would be:

```
0 1 2
3 4 5
```

## Challenge

Generate a range grid, given `m` and `n`. You can display it, or return an array.

This is `code-golf`. Shortest answer in each language wins.