Kataba can remain lexically transitive even without an overt object; qāma is normally intransitive. An unspoken object and a verb that takes no object are different.
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Omitted versus Absent Object
Intransitive and Transitive Verbs: One, Two, Three Objects
Kataba can remain lexically transitive even without an overt object; qāma is normally intransitive. An unspoken object and a verb that takes no object are different.