Decoder memory design Tutorials

Please finish the tutorials

http://www.4shared.com/document/bNttK42c/en217_seminar_sht8_sol.html
http://www.4shared.com/document/MPnqfhgR/addrdecoding2_solutions.html
http://www.4shared.com/document/zmu8Uirf/addrdecoding_solution.html
http://www.4shared.com/document/hjAhn6dD/en217_seminar_sht8.html