Instead of expressing [ɛ] with ARABIC LETTER AE, they create the appropriate on-screen letter form by typing ARABIC LET-TER HEH and then, when necessary, preventing it from joining with the following letter using the special invisible character ZERO WIDTH NON-JOINER U+200C.
an entirely digital complication in processing Sorani text regards the Unicode expression of the very frequent short vowel /ɛ/ (also transcribed as /ae/), which is expressed by a special variant of the arabic letter heh .