High quality Directory entries are done

I have to target 10 keyword's, and i am doing directory submission. I have 10 Unique titles and 10 unique description. I just need to submit these 10 keywords in 50 directory's10 keywords * 50 directory = 500 submission.I will just submit the same 10 Unique titles and 10 unique description to these 500 directory. So it wont be count as duplicate content and duplicate title in every directory