網址: https://ai2-s2-public.s3.amazonaws.com/figures/2017-08-08/1d0283b83f73f05b6130049caee41eb2c0c0efe0/45-Figure1-1.png
網址2: https://www.semanticscholar.org/paper/Gromov’s-Theory-of-Multicomplexes-with-Applications-Frigerio-Moraschini/1d0283b83f73f05b6130049caee41eb2c0c0efe0/figure/0
