Consonants allowed in syllable codas are . The phonotactics of many languages forbid syllable codas. Syllables without glottalized codas developed the opposite tone. The only codas allowed are nasal consonants. Finals with vocalic codas generally parallel those with dental or velar codas. Sperm whales can produce three specific vocalisations&colon; creaks, codas, and slow clicks. In English, for example, all onset consonants except are allowed as syllable codas. Some languages, such as Hawaiian, forbid codas, so that all syllables are open. And, the third level represents the phonemes ( syllabic information including onset, vowels, and codas). Seven vowel phonemes, together with the codas and , are organized into forty-six rimes. Similarly, retroflex codas ("erhua") are typically avoided in Taiwan and Singapore. When sperm whales socialize, they emit complex patterns of clicks called codas. Introductions and codas also extended the form. The opening codas "louder and more animatedly until the very end". Clusters of nasal and stop are only allowed in codas.