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