Khālidun has visible nominative; hādhā is indeclinable but occupies the nominative subject slot; Mūsā is declinable with estimated nominative.
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Visible, Positional and Estimated Case
Advanced Parsing Workshop: Integrated Grammar
Khālidun has visible nominative; hādhā is indeclinable but occupies the nominative subject slot; Mūsā is declinable with estimated nominative.