 Livingston has also employed the assistance of other people , notably Michael Clements , founder of the Half @-@ Life 2 comics repository <unk> , and creator of <unk> , another comic based on Half @-@ Life 2 . Clements aided him in enhancing the presentation of Concerned . Greg <unk> , creator of <unk> , also assisted in site maintenance , and Livingston later offered him a " guest week special " , in which <unk> wrote and published three issues for Concerned . A similar set of three issues have also been published by Joe <unk> , during a week when Livingston was unavailable . 
