did. Comparing late documents with early ones, it is apparent that the sequences sel- and nel-, which Rowan takes to be /sl/ and /nl/ and which commonly occurred with the determiner -l-, assimilated over time to t and l (perhaps /t/ and /ll/). The only punctuation mark was a word and phrase divider of two to three dots. Principles Meroitic was a type of alphabet called an abugida: The vowel /a/ was not normally written; rather it was assumed whenever a consonant was written alone. That is, the single letter m was read /ma/. All other vowels were overtly written: the letters mi, for example, stood for the syllable /mi/, just as in the Latin alphabet. This system is broadly similar to the Indian abugidas that arose around the same time as Meroitic. Griffith and Hintze Griffith identified the essential abugida nature of Meroitic when he deciphered the script in 1911. He noted in 1916 that certain consonant letters were never followed by a vowel letter, and varied with other consonant letters. He interpreted them as syllabic, with the values ne, se, te, and to. Ne, for example, varied with na. Na could be followed by the vowels i and o to write the syllables ni and no, but was never followed by the vowel e. He also noted that the vowel e was often omitted. It often occurred at the ends of Egyptian loanwords that had no final vowel in Coptic. He believed that e functioned both as a schwa and a "killer" mark that marked the absence of a vowel. That is, the letter m by itself was read , while the sequence me was read or . This is how Ethiopic works today. Later scholars such as Hitze and Rilly accepted this argument, or modified it so that e could represent either or schwa–zero. It has long been puzzling to epigraphers why the syllabic principles that underlie the script, where every consonant is assumed to be followed by a vowel a, should have special letters for consonants followed by e. Such a mixed abugida–syllabary is not found among the abugidas of India, nor in Ethiopic. Old Persian cuneiform script is somewhat similar, with more than one inherent vowel, but is not an abugida because the non-inherent vowels are written with full letters, and are often redundantly written after an inherent vowel other than /a/. Millet and Rowan