Two of the four prefixes belong to the speaker forms:
Example patternPersonPrefix
أَفْعُلُI — first-person singularأ
نَفْعُلُWe — first-person non-singularن
So Hamzah appears in 1 position and Noon appears in 1 position of the 14-form grid.
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Hamzah and Noon: The Speaker Forms
Introduction to the Present/Future Tense (Fi'l Mudhaari') & its Signs
Two of the four prefixes belong to the speaker forms:
Example patternPersonPrefix
أَفْعُلُI — first-person singularأ
نَفْعُلُWe — first-person non-singularن
So Hamzah appears in 1 position and Noon appears in 1 position of the 14-form grid.