زَيْدٌ كَرِيمٌ، وَخَالِدٌ أَكْرَمُ.
The context supplies the comparator. Min Zaydin is omitted by contextual evidence; it does not establish an unrestricted fourth pattern.
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When the Comparator Is Understood
Ism al-Tafḍīl: Formation, Comparison, Agreement and Parsing
زَيْدٌ كَرِيمٌ، وَخَالِدٌ أَكْرَمُ.
The context supplies the comparator. Min Zaydin is omitted by contextual evidence; it does not establish an unrestricted fourth pattern.