Huallaga Quechua notably lacks the ejectives and contrastive aspiration of stops present in other Quechua dialects, such as the Cuzco dialect. The presence of voiced stops primarily in loanwords seems to be common across dialects. Both mid vowels in Huallaga Quechua are also Spanish loans. The original three-vowel inventory, contrasting only height and backness, is typical across Quechua dialects. Length is contrasted phonemically in Huallaga Quechua. Though phonetically length is a vocalic feature, the phonological system treats vowel length as a consonant. This becomes especially important in the limitations on syllable structure. See segmentation rules. Fine semantic differences may be expressed by vowel length:   In Spanish loanwords, Huallaga Quechua often renders accented syllable stress as vowel length, even if the stress does not fall on the penult. The maximal syllable structure of Huallaga Quechua is CVC, with V, VC, and CV all being permissible as well. CCC, CC#, #CC, and VV are impermissible. When segmenting a word in Huallaga Quechua for syllables, the process is systematic and straightforward. Begin from the end of the word, working backwards - all vowels become syllable nuclei. If the word ends in a consonant, that consonant is the coda to the word's final syllable. Any single consonant preceding a vowel is the onset to that syllable. Any two consonants in a row will be spanning a syllable boundary. It is important to keep in mind that consonants in this case include length; a CV: syllable is not an open syllable, but a bimoraic closed syllable. The addition of morphological affixation complicates the derivation of felicitous syllables. Certain suffixes begin with consonant clusters or consist of single consonants, including vocalic length. The only environment in which these suffixes would not produce impermissible syllables is following a non-lengthened vowel at the end of a root. The category of possessive suffixes in particular undergoes a syllable insertion process in order to prevent the affixation of these suffixes to bimoraic roots from producing illegal structures. The meaningless syllable "-ni-" is inserted at the morpheme boundary where a bimoraic-final root meets a possessive suffix with a consonant that appears before a syllable boundary.