## {4,4}, domino 1F + domino 1F, solution 20
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 4](1 0')[2 2'][3 3'](5 4')[1' 5']")
sublines(1)