For example, the kanji 生, pronounced "shō" or "sei" in borrowed Chinese vocabulary, stands for several native Japanese words as well. When these words have inflectional endings (verbs/adjectives and adverbs), the end of the stem is written phonetically: as well as the hybrid Chinese-Japanese word Note that some of these verbs share a kanji reading ("i," "u," and "ha"), and okurigana are conventionally picked to maximize these sharings. These phonetic characters are called "okurigana." They are used even when the inflection of the stem can be determined by a following inflectional suffix, so the primary function of "okurigana" for many kanji is that of a phonetic complement. Generally it is the final syllable containing the inflectional ending is written phonetically. However, in adjectival verbs ending in "-shii," and in those verbs ending in "-ru" in which this syllable drops in derived nouns, the final two syllables are written phonetically. There are also irregularities. For example, the word "umareru" 'be born' is derived from "umu" 'to bear, to produce'. As such, it may be written 生まれる [生mareru], reflecting its derivation, or 生れる [生reru], as with other verbs ending in elidable "ru." Chinese never developed a system of purely phonetic characters. Instead, about 90% of Chinese characters are compounds of a determinative (called a 'radical'), which may not exist independently, and a phonetic complement indicates the approximate pronunciation of the morpheme. However, the phonetic element is basic, and these might be better thought of as characters used for multiple near homonyms, the identity of which is constrained by the determiner. Due to sound changes over the last several millennia, the phonetic complements are not a reliable guide to pronunciation. The Maya Script, the logosyllabic orthography of the Maya Civilization, used phonetic complements extensively and phonetic complements could be used synharmonically or disharmonically. The former is exemplified by the placement of the syllabogram for "ma" underneath the logogram for "Jaguar" (in Classic Maya, "BALAM"): thus, though pronounced ""BALAM"", the word for "jaguar" was spelled ""BALAM-m(a)"".