The short vowels tended to lengthen in various positions. In the process of lengthening, the high vowels were lowered. In the Secunda, the lengthened reflexes of are ; when kept short they generally have reflexes . Stressed open syllables with a short vowel (i.e. syllables consisting of a short vowel followed by a consonant and another vowel) had the vowel reduced to and the stressed moved one syllable later in the word (usually to the last syllable of the word). Stress was originally penultimate and loss of final short vowels made many words have final stress. However, words whose final syllable had a long vowel or ended with a consonant were unaffected and still had penultimate stress at this point. This change did not happen in pausal position, where the penultimate stress is preserved, and vowel lengthening rather than reduction occurs. The previous three changes occurred in a complex, interlocking fashion:   Examples:  Note that many, perhaps most, Hebrew words with a schwa directly before a final stress are due to this stress shift. This sound change shifted many more originally penultimate-stressed words to have final stress. The above changes can be seen to divide words into a number of main classes based on stress and syllable properties:    were reduced to in the second syllable before the stress, and occasionally reduced rather than lengthened in pretonic position, especially when initial (e.g. σεμω = 'his name'). Thus the vowel system of the Secunda was . The later Jewish traditions (Tiberian, Babylonian, Palestinian) show similar vowel developments. By the Tiberian time, all short vowels in stressed syllables and open pretonic lengthened, making vowel length allophonic. Vowels in open or stressed syllables had allophonic length (e.g. in ('he will have mercy') < previously short < by Tiberian degemination of < PSem ). The Babylonian and Palestinian vocalizations systems also do not mark vowel length. In the Tiberian and Babylonian systems, and lengthened become the back vowel . In unaccented closed syllables, become (Tiberian), (Babylonian), or (Palestinian) – generally becoming the second vowel before geminates (e.g. ) and the first otherwise. In the Tiberian tradition pretonic vowels are reduced more commonly than in the Secunda.