How many passwords combinations can we find of length 3?

```
*    *    *

*    *    *

*    *    *
```

examples:
* `[0,0], [0,0], [0,0]`
* `[2,1], [1,1], [0,1]`

---------------------------------

### Constraint 1: all the combinations must be "adjacent"

Where "adjacent" means they're either up, down, left or right.


examples:
* `[0,0], [0,1], [1,1]`

```
1----2    *
     |
*    3    *

*    *    *
```


* `[2,1], [1,1], [0,1]`

```
*    3    *
     |
*    2    *
     |
*    1    *
```