## {4,4}, domino 1F + domino 1F, solution 21
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 2')[2 0'](3 4')[5 3'][1' 5']")
sublines(1)