1 Subjects: “...object obstacle avoidance...”

2 Subjects: “...obstacle recognition...”

3 Subjects: “...obstacle detection...”

4 Subjects: “...obstacle avoidance...”

5 Subjects: “...obstacle avoidance...”

6 Subjects: “...learning barriers obstacles...”

7 Subjects: “...learning barriers obstacles...”

8 Subjects: “...obstacle detection...”

9 Subjects: “...obstacle detection...”

10 Subjects: “...obstacle course...”