When the stressed syllable is underlyingly heavy (such as "LHL)"), there is dialectal variation. The Chaplinski variety of Central Siberian Yupik shows no extra lengthening of the already long vowel: the heavy syllables remain heavy (no change). The St. Lawrence variety of Central Siberian Yupik has further iambic overlengthening, resulting in a change from underlying heavy to a phonetically superheavy syllable (S). In those cases, Central Alaskan Yup'ik changes the first light syllable in what would be a (LH) foot to a heavy syllable which then receives stress. The light to heavy shift is realized as consonant gemination (of the onset) in CV syllables and as consonantal lengthening of the coda in CVC syllables: