Roots are sometimes monosyllabic, but mostly disyllabic or a word consisting of two syllables. Most Proto-Mayan roots were "monosyllabic" except for a few disyllabic nominal roots. One of these is the distinction between disyllabic roots and monosyllabic roots. In disyllabic words a strong penultimate syllable receives primary stress. Native disyllabic morphemes such as ' (, "spider") have consonant alliteration. In most native disyllabic words, the first syllable is a minor (fully unstressed) syllable. RP vowel is either a disyllabic sequence or merges with the vowel . Most represent CV syllables, though there are a few disyllabic signs. In modern Mandarin, however, most nouns, adjectives and verbs are largely disyllabic. Neither exists as an independent morpheme except as a poetic abbreviation of the disyllabic word. Stress in Iau is predictable&colon; it falls on the final syllable of disyllabic words. Deideophonic verbs are formed rather irregularly from disyllabic ideophones. However, a few morphemes are disyllabic, some of them dating back to Classical Chinese. Most roots (70%) are disyllabic; about 20% are monosyllables and 10% trisyllables. In Modern Javanese, a disyllabic root is of the following type&colon; .