Completed the following sentence: Robinson represented his native country in four consecutive Summer Olympics, starting in 1956, where as a 18-year-old, he competed in the 100 metres and 200 metres but did not advance beyond the first round in either event. ️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️ 1968 Summer Olympics, Robinson was part of the team that reached the semi-finals of the
4 × 100 metres relay, where they were disqualified before the finals.