The validator said me: "Be sure that the lines list has the ADDED label with the required lines in the correct places." I checked the program with the 22 test cases shown in the attached image and my program gives the outputs shown in red. (I made sure that this program would never be able to give consecutive ADDED/REMOVED pairings. And in my opinion it tags the lines correctly with the labels.) 1) Which case violates CodeGym's (unspoken?secret?) requirements, and how? What would be the correct output for the given incorrect case so that the validator can accept it? 2) Or an other option: what case did I forget to test that gives incorrect output?