## {4,4}, pentomino 7 (N), solution 21
e2.
angleunit(pi/2)
# the line below lets us specify internal angles
angleofs(pi)
unittile(1,1,2,1,3,2,1,1,2,2,1,3)
# the Conway notation
conway("[0 2][1 11](3 10)[4 7][5 8][6 9]")
sublines(1)