2434. Disyllabic perfects and perfect participles have the vowel of the
penult long when it stands before a single consonant: as,
#vēnī#, #vīdī#, #vīcī# (862); #fōvī# (864), #fōtus# (917).
Exceptions.
2435. (_a._) Nine perfects have the penult short (859-861):
bibī, -fidī
dedī, scidī
stetī, stitī
tulī, -tudī, per-culī.
2436. (_b._) Ten perfect participles have the penult short (918; see
also 919):
citus, datus
itum, ratus
-rutus, satus
situs, status
litus, quitus.