the vocabulary for the ROILA project. The purpose of the study was to investigate the use of an artificial language on the accuracy of machine speech recognition, and it was revealed that the modified vocabulary of Toki Pona significantly outperformed English. In 2015, YouTuber jan Misali uploaded a series titled 12 days of , which proved influential and was recommended as a learning tool by creator Jonathan Gabel. In 2021, Lang released her second book, Toki Pona Dictionary, a comprehensive two-way Toki Pona–English dictionary including more than 11,000 entries detailing the use of the language as she gathered from polls conducted in the Discord server over a few months. The book presents the original 120 words plus 16 (major dictionary words) as gathered from at least over 40% of respondents. It also contains 45 words given by 40% or less of respondents, referred to as (minor dictionary words). Phonology and phonotactics Inventory Toki Pona has nine consonants () and five vowels (), shown here with the International Phonetic Alphabet symbols. Stress falls on the initial syllable of a word, and it is marked by an increase in loudness, length, and pitch. There are no diphthongs, vowel hiatus, contrasting vowel length, consonant clusters (except those starting with the nasal coda), or tones. Both its sound inventory and phonotactics are compatible with the majority of human languages, and are therefore readily accessible. Distribution The statistical vowel spread is fairly typical when compared with other languages. Counting each root once, 32% of vowels are , 25% are , with and a bit over 15% each, and 10% are . The usage frequency in a 10kB sample of texts was slightly more skewed: 34% , 30% , 15% each and , and 6% . Of the syllable-initial consonants, is the most common, at 20% total; are over 10%, then the nasals (not counting final N), with the least common, at little more than 5% each, being . The high frequency of and low frequency of is somewhat unusual among the world's languages. Syllable structure Syllables are of the form (C)V(N), i.e. optional consonant + vowel + optional final nasal, or V, CV, VN, CVN. The consonant is obligatory in syllables that are not word-initial. As in most languages, CV is the most common syllable type, at 75% (counting each root once). V and CVN syllables are each around 10%, while only 5 words have