The five letters are the consonants . is the addition of a slight "bounce" or reduced vowel sound /ə/ to the consonant whose vowel sound is otherwise cancelled, such as by a , , or the end of sentence [REF].
The biggest bounce is when the letter is at the end of the word and is accompanied by a , such as the end of the first verse of Sūrat "al-Masad":[REF] .