Yeah i did using namecheap search, maybe it was a fluke from the domain hosting search engine. but still have 2 available domains hope it passes the OP`s first requirements. because the 5l domain that have 3 same letter and 2 same is hard to find.
Do not want to be pessimistic but I doubt that anyone will find a single domain like this:
...only composed of two different letters hhccc.com etc and doesn't include vowels O I U E A V...
As I said in a previous post i will put what I found here since the OP rejected it:
hlzhz.com $2.99 1st yr
hlyhy.com $2.99 1st yr
nxxst.com $2.99 1st yr (i like this one)
snxsx.com $2.99 1st yr