[iforgotpassword]

Most importantly, you can always pick a simple, predictable sentence, or one with enough redundancy to "prove" that point. Some everyday simple sentences might work in pinyin even without the accents for tones. Try an excerpt from a patent application and I'm sure even with tones you'll fail.

> mchncl lmt xsts t th wdth f sngl xhst prt, t bt 62% f th br dmtr fr rsnbl pstn rng lf.

> Th rd vlv s smpl bt ffctv frm f chck vlv

That's just from a Wikipedia page I have open from earlier. Already quite a bit harder to decipher.