The six class features differ in kind: mughālabah is a specialised construction; predominant intransitivity is a frequency claim; throat consonants represent a phonetic tendency; and Ḥasiba has a restricted set of recorded words.
FormFirst question to ask
بَاعَ يَبِيعُIs root ب ي ع hollow-yāʾ?
فَرِحَDoes the Samiʿa pattern fit a condition?
مَنَعَ يَمْنَعُIs the third radical a throat consonant?
حَسُنَ يَحْسُنُDoes the Karuma verb name a trait?
وَثِقَIs it an attested Ḥasiba verb?
Next comes the independent topic properties of Form IV (Bāb Ifʿāl), beginning on printed page 88.