## {4,4}, pentomino 12 (P), solution 21
e2.
angleunit(pi/2)
# the line below lets us specify internal angles
angleofs(pi)
unittile(1,1,2,2,1,2,1,2,1,3)
# the Conway notation
conway("[0 2][1 9](3 8)(4 7)(5 6)")
sublines(1)
sublines(2)