## Euclidean square tiling
e2.

angleunit(deg)
unittile(90,90,90,90,|0)
c(0,0,0,0,0)
repeat(0, 4)

#/ four self-connected edges
quotient(0,1,2,3)
#/ four mirrors
quotient(0$,1$,2$,3$)
#/ tiny torus
quotient(2,3,0,1)
#/ whirlwind
quotient(1,0,2$,3$)
#/ three squares
quotient(0,4,8,10$,1,11$,9,7,2,6,3$,5$)