Here's the Solution; don't read if you're going to whine about me spoiling it... p= policeman, c= criminal m= mother, f= father B1/B2 - boys G1/G2 - girls 01. P and C Over 02. P back 03. P + B1 over 04. P + C back 05. M + B2 over 06. M back 07. M + F over 08. F back 09. P + C over 10. M back 11. F + M over 12. F back 13. F + G1 over 14. P + C back 15. P + G2 over 16. P back 17. P + C over voila!