Matā is a jussive conditional adverb. Mā reinforces it without replacing it as the governor; both verbs have jussive final sukūn.
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Matā Mā: A Jussive Condition
Additional Particles: Seven Forms, Emphasis and Syntactic Case
Matā is a jussive conditional adverb. Mā reinforces it without replacing it as the governor; both verbs have jussive final sukūn.