This group has only two forms, so a table is unnecessary.
● يَفْعَلْنَ is used for third-person feminine plural: هُنَّ يَكْتُبْنَ — Those women write.
● تَفْعَلْنَ is used for second-person feminine plural: أَنْتُنَّ تَكْتُبْنَ — You all (women) write.
The nūn here is part of the feminine-plural ending, not the inflectional nūn of the second group.
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Three Groups of Imperfect Forms
This group has only two forms, so a table is unnecessary.
● يَفْعَلْنَ is used for third-person feminine plural: هُنَّ يَكْتُبْنَ — Those women write.
● تَفْعَلْنَ is used for second-person feminine plural: أَنْتُنَّ تَكْتُبْنَ — You all (women) write.
The nūn here is part of the feminine-plural ending, not the inflectional nūn of the second group.