## {4,4}, tromino 1F + tromino 1F, solution 20
e2.
angleunit(pi/2)
# the line below lets us specify internal angles
angleofs(pi)
unittile(1,1,2,2,1,1,2,2)
unittile(1,1,2,2,1,1,2,2)
# the Conway notation
conway("(0)(1 1')[2][3][4](5 5')(6 3')(7 2')[0'](4')[6'][7']")
sublines(1)