8 blocks
init:
on 0 6
on 1 t 
on 2 t
on 3 7
on 4 t
on 5 t
on 6 4
on 7 5
goal:
on 3 5
on 5 4
on 4 7
on 7 2
on 2 0 
on 0 6
on 6 1
