Input (grade 13): To the north of Johannesburg, the altitude drops beyond the escarpment of the Highveld, and turns into the lower lying Bushveld, an area of mixed dry forest and an abundance of wildlife.
Output (grade 7): To the north of Johannesburg, the altitude drops beyond the escarpment of the Highveld. It then turns into the lower lying Bushveld, an area of mixed dry forest and a lot of wildlife.