Case 1:  Luke and Leia can escape in 8 steps.
Case 2:  Luke and Leia cannot escape.
Case 3:  Luke and Leia can escape in 9 steps.
Case 4:  Luke and Leia can escape in 11 steps.
Case 5:  Luke and Leia can escape in 15 steps.
Case 6:  Luke and Leia can escape in 4 steps.
Case 7:  Luke and Leia cannot escape.