## {4,4}, square 1R4 + square 1F, 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')(2' 3')(1 0')(2 0')(3 0')")