ass salaamu alaykum MAW....
i think it was in that book, umm salamah used to teach..bil fath ...bil kasr...wa bi dhammi..just can't remember the books.
Sheikha Aysha also mentioned it in daraaree when we we're doing "kitaab al-luqata".....
it goes sumthing like...luqaatatun wa luqatatun wa laqata...

BTW : what was that books name ..^^^ bil fath....it had like all the words that change from alif -kasr-fatha , in to a qaseeta!
wa alaykum ass salaam