Extraction code: 79wa? Lecture series on bicycles and taxis 2 \ One of the series on bicycles and taxis. Lecture series on bicycles and taxis 2 \ Lecture series on bicycles and taxis 2. Lecture series on bicycles and taxis 5 \ Lecture series on bicycles and taxis 5. Lecture series on bicycles and taxis 5 \ Lecture series on bicycles and taxis 4. Lecture series on bicycles and taxis 5 \ Lecture series on bicycles and taxis 6.