Compensative Lengthening
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Chapter 3.1.B.2.a
Gutturals will add the definite article with either compensative lengthening (Aleph, Ayin, Resh) or virtual doubling (He, Heth).
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Chapter 20.1.C
The Pual II-Guttural is irregular.
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Chapter 19.2.A
The Niphal I-Guttural is irregular.