Do not be limited by what somebody else thinks should be in a package!  You combine only the items that you want to have.  To get a 20% discount simply select at least one item from each of the four steps and use coupon code "All 4 Steps" at checkout.  We must warn you that our system will accept the coupon code regardless of how many "steps" you select.  If this happens we will send you a corrected invoice with the balance and process your order.