Line 4
困蒙.吝.
Kun 困: hindered, blocked (阻礙)
吝: difficulties; difficult progress (see hexagram 3, line 3)
Blocked ignorance. Difficulties.
Line 5
童蒙.吉.
About tong meng 童蒙: see Judgement
Repeated ignorance. Auspicious.
Line 6
擊蒙.不利為寇.利禦寇.
Ji 擊: attack. The Shanghai Museum MS has 墼 = 毄, ‘attack’.
Kou 寇: invaders, enemies.
兵作於內為亂, 於外為寇.
Hostilities within the State produce rebellion, while hostilities from without are from enemies.
(Zuo Zhuan, tr. James Legge)
Attack ignorance.
Not advantageous for invaders,
Advantageous for guarding against invaders.