## {4,4}, domino 1F + domino 1F, solution 18
e2.
angleunit(pi/2)
# the line below lets us specify internal angles
angleofs(pi)
unittile(1,1,2,1,1,2)
unittile(1,1,2,1,1,2)
# the Conway notation
conway("(0 5)(1 2')(2 1')[3 5'](4 3')[0' 4']")
sublines(1)