ʿAdl + proper name: عُمَر, زُفَر.
ʿAdl + adjectival status: ثُلَاث, مَثْلَث, أُخَر, جُمَع.
Original adjectival status + verb pattern: أَسْوَد, أَرْقَم.
The book does not count proper-name status + waṣf as a simultaneous pair here, and it also excludes ʿadl + verb pattern.
Different causes can produce the same visible diptote endings.
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Causes of Diptote Status — ʿAdl and Waṣf
ʿAdl + proper name: عُمَر, زُفَر.
ʿAdl + adjectival status: ثُلَاث, مَثْلَث, أُخَر, جُمَع.
Original adjectival status + verb pattern: أَسْوَد, أَرْقَم.
The book does not count proper-name status + waṣf as a simultaneous pair here, and it also excludes ʿadl + verb pattern.
Different causes can produce the same visible diptote endings.