## {4,4}, square 1S2a + square 1S2a, 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)(1 0')(2)(3 2')(1')(3')")