The light emphatic nūn «نْ» also adds emphasis to prohibition but is not doubled. The source displays light-nūn forms in eight of the fourteen positions for each voice, leaving six positions blank.
Word / formMeaning / explanation
لَا تَفْعَلَنْdo not do it, emphatically.
لَا يَفْعَلَنْlet him emphatically not do it.
لَا نَفْعَلَنْlet us certainly not do it.
Four dual positions and the two feminine-plural positions have no light-nūn entries in this source paradigm. Filling them by mechanical analogy would misrepresent the table.