allowed in syllabic verse system. Together with introducing syllabo-accentual metres, masculine rhymes began to occur in Polish poetry. They were most popular at the end of 19th century. The most frequent rhyme scheme in Old Polish (16th - 18th centuries) was couplet AABBCCDD..., but Polish poets, having perfect knowledge of Italian language and literature, experimented with other schemes, among others ottava rima (ABABABCC) and sonnet (ABBA ABBA CDC DCD or ABBA ABBA CDCD EE). The metre of Mickiewicz's sonnet is the Polish alexandrine (tridecasyllable, in Polish "trzynastozgłoskowiec"): 13(7+6) and its rhymes are feminine: [anu] and [odzi]. Portuguese Portuguese classifies rhymes in the following manner: rima pobre (poor rhyme): rhyme between words of the same grammatical category (e.g. noun with noun) or between very common endings (-ão, -ar); rima rica (rich rhyme): rhyme between words of different grammatical classes or with uncommon endings; rima preciosa (precious rhyme): rhyme between words with a different morphology, for example estrela (star) with vê-la (to see her); rima esdrúxula (odd rhyme): rhyme between proparoxytonic words (example: ânimo, "animus", and unânimo, "unanimous"). Russian Rhyme was introduced into Russian poetry in the 18th century. Folk poetry had generally been unrhymed, relying more on dactylic line endings for effect. Two words ending in an accented vowel are only considered to rhyme if they share a preceding consonant. Vowel pairs rhyme—even though non-Russian speakers may not perceive them as the same sound. Consonant pairs rhyme if both are devoiced. As in French, formal poetry traditionally alternates between masculine and feminine rhymes. Early 18th-century poetry demanded perfect rhymes that were also grammatical rhymes—namely that noun endings rhymed with noun endings, verb endings with verb endings, and so on. Such rhymes relying on morphological endings become much rarer in modern Russian poetry, and greater use is made of approximate rhymes. Sanskrit Patterns of rich rhyme (prāsa) play a role in modern Sanskrit poetry, but only to a minor extent in historical Sanskrit texts. They are classified according to their position within the pada (metrical foot): ādiprāsa (first syllable), dvitīyākṣara prāsa (second syllable), antyaprāsa (final syllable) etc. Spanish Spanish mainly differentiates two types of rhymes: rima consonante (consonant rhyme): Those words of the same stress with identical endings, matching consonants and vowels, for example robo (robbery) and lobo (wolf), legua (league) and yegua (mare) or canción (song) and montón (pile). rima asonante (assonant rhyme): those words of the same stress that only