4. The method of operating an electronic device as defined in claim 1 , further comprising the steps of: detecting a user input for going back in the content string after the adding step; and eliminating the most probable completion alternative from the content string.
4. The method of operating an electronic device as defined in claim 1 , further comprising the steps of: detecting a user input for going back in the content string after the adding step; and eliminating the most probable completion alternative from the content string. 5. The method of operating an electronic device as defined in claim 4 , wherein the user input comprises a user pressing a left control of the navigation key.