The active Light-Noon forms occupy these 8 grammatical positions:
FormPosition
لَيَفْعَلَنْmasculine Ghaa'ib singular
لَتَفْعَلَنْfeminine Ghaa'ib singular
لَتَفْعَلَنْmasculine Haadhir singular
لَتَفْعَلِنْfeminine Haadhir singular
لَيَفْعَلُنْmasculine Ghaa'ib plural
لَتَفْعَلُنْmasculine Haadhir plural
لَأَفْعَلَنْMutakallim singular
لَنَفْعَلَنْMutakallim plural
Two positions share the same written form, so 8 grammatical positions do not mean 8 different spellings.