فَتَحَ — مَفْتُوحٌ؛ حَفِظَ — مَحْفُوظٌ
Maftūḥ and maḥfūẓ follow the same mafʿūl pattern with different roots.
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Two More Form-I Examples
Ism al-Mafʿūl: Formation, Weak Roots and Government
فَتَحَ — مَفْتُوحٌ؛ حَفِظَ — مَحْفُوظٌ
Maftūḥ and maḥfūẓ follow the same mafʿūl pattern with different roots.