## {4,4}, tetromino 3F (S), solution 12
e2.
angleunit(pi/2)
# the line below lets us specify internal angles
angleofs(pi)
unittile(1,1,2,1,3,1,1,2,1,3)
# the Conway notation
conway("[0 4][1 5][2 6][3 9](7 8)")
sublines(1)