working with laravel 5.6 and mysql. I have following table name as `vehicles`

```
id  name  categoryname  brandname    model
1   juy   car           toyota       121
2   gty   van           nissan       caravan
3   bgh   car           bmw          520d
4   hyu   van           ford         max
5   nhj   car           toyota       121

```

now I need print separately each brandnames with related to categoryname like this,

```
car
toyota
bmw

van
nissan
ford

```

how can I do this in my controller?