Ha. it gets worse. Search engines or blacklist processors often use gigantic url lists, which are stored as plain ASCII, which is then fed into a perfect hash generator, which accesses those url's unordered. I.e. they need to create a second ordering index to access the urllist. The perfect hashing guys are mathematicians and so they don't care because their definition of a mphf (minimal perfect hash function) is just a random ordering of unique indices, but they don't care to store the ordering also. So we have ASCII and no index.