using aspell for Arabic with diacritics

Even though I know most written Arabic doesn't use diacritic marks, it 
is very helpful for beginners. My problem is that I have a lot of words 
written with diacritics, when trying to spellcheck them with aspell, 
aspell refuses them as correct. I thought it would be just a matter of 
telling aspell not to look at the diacritics as follows:
cat tekst.ar |aspell -a -d ar --ignore-accents=true

but it seems not the right way to do this
I also thought of using a filter something like:
cat tekst.ar | tr 'harakaat' -d |aspell -a -d ar

but I don't know what to use for 'harakaat'

any help welcome

hugo
p.s. I added a little sample file called tekst.ar

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