Two people are riding bicycles next to a building.
A woman is riding a unicycle past a building.
Either there are two people or a woman. One cannot ride a bicycle and a unicycle at the same time. They are either next to a building or past it.
A woman cannot be riding bicycles next to a building and past a building at the same time.
A bicycle and unicycle have two and one wheel, respectively, and thus are not the same.