344 7 Verbal morphology
Prohib), as is true of long imperfectives in all stem classes. If the optional -t- in
-(t-)aPPaC- is disregarded, we can save the generalization that the accent
targets the first postconsonantal V ("pel") in all three cases. We also observe
lengthening of the accented V in all three cases, from /ae/ to ά. It appears,
however, that -PdQQaeC- and -t-aPPaeC- show lengthening due to the χ-pcl
component, which targets the first postconsonantal V; as usual with this
component, it applies only to the LoImpfP (and is absent from the LoImpfN
and Prohib stems). On the other hand, the lengthening in LoImpfP -(t-)aPPaC-
for -vPvC- stems appears to be due to χ-f (lengthening of the V of the final
syllable), since (as with χ-f in trisyllabic or longer stems) it is observed in
LoImpfN -(t-)aPPiC- and Prohib -(t-)aPPaC- as well as in the LoImpfP.
Since the Prohib (like the LoImpfP) has a melody or in all
three types, the overlain stem-wide of the LoImpfN is distinctive.
The three verb types have sharply different productive VblN patterns:
a-PseQaC, uPsC, and e-PeC. The prefixes in a-PsQaC and e-PeC are subject
to Prefix Reduction in the dependent state (§3.5.1), and have MaPl suffixal
plurals with i-...-aen. The uPaC VblN type has a productive PI üPCaw-aen in
T-ka (also attested in R and K-d). A-grm usually has uPaC-asn or uPC-an.
This uPsC looks quite isolated in the context of (347-8), but the same -vPPvC-
verbs also show -uPvC- shapes in prefixal derivatives such as the causative
and agentive. For example, -vqqvl- 'go back' has a causative -s-urvl- 'give
back' with Imprt s-üral, while -vddvr- 'be alive' has an agentive a-m-udaer
(§8.8.1).