clopen: after
clopen: before
clopen: identity
clopen: sigma_2 sigma_1
clopen: (sigma_2 sigma_1)^2
clopen: (sigma_2 sigma_1)^3
clopen: (sigma_2 sigma_1)^4
clopen: fun with wontons, part 1
clopen: fun with wontons, part 2
clopen: fun with wontons, part 3
clopen: fun with wontons, part 4
clopen: fun with wontons, part 5
clopen: fun with wontons, part 6
clopen: fun with wontons, part 7
clopen: potstickers