digital logic question

Design an circuit using D FF such that: - if the input "x" equals "0" the counter follows the following order: 0-2-1-3-0-2-1-3-... - if the input "x" equals "1" the counter follows the following order : 3-1-2-0-3-1-2-0-..... there should be two output, "Y" & "z" such that: - when the counter switches from "1" to "3" then the output "y" should equal to "1" zero otherwise. - when the counter equals "2" the output "z" should equal to "l", zero otherwise