english: of XX by passing to the quotient space which collapses {x}×I\{x\} \times I to a point (this example)
non_english: OuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuÃ©Ã©Ã©Ã©Ã©Ã©Ã©Ã©Ã©Ã©Ã©Ã©Ã©Ã©Ã©Ã©Ã©Ã©Ã©Ã©Ã©Ã©Ã©Ã©Ã©Ã©Ã©Ã©Ã©Ã©Ã©Ã©Ã© /o/