## {4,4}, square 1S4 + square 1S4, solution 1
e2.
angleunit(pi/2)
# the line below lets us specify internal angles
angleofs(pi)
unittile(1,1,1,1)
unittile(1,1,1,1)
# the Conway notation
conway("(0 0')(1 1')(2 2')(3 3')")