8.6.1 The FOL tactic 8.6.2 A complete set of connectives 8.6.3 Lemma 3.2a' 8.6.4 Line L01 of 3.2a' 8.6.5 Line L02 of 3.2a' 8.6.6 Line L03 of 3.2a' 8.6.7 Hypothetical reasoning