## {3,9}, diamond 1F + diamond 1F, solution 7
h2.
angleunit(2*pi/9)
# the line below lets us specify internal angles
angleofs(pi)
distunit(edge(3,9))
unittile(1,2,1,2)
unittile(1,2,1,2)
# the Conway notation
conway("(0)(1 3)(2 1')[0' 2'](3')")
sublines(1)