Wow! I have already received some feedbacks on the photos I just posted. For some strange reasons, it is not possible to save them to the hard disk. I don't know why. And that is indeed a big problem! You see, in some cases, it may be necessary to zoom in to those small signs to be able to see clearly.
Now I don't know how else to enlarge these photos beyond the clicking of those photos. So this is what I am going to do now. I will send out these photos to some of you who I know will try these questions, even if you're not going to submit any answers in the end. For the rest of you, please write me an email and I will send these photos to you through emails. Don't worry, still plenty of time to deal with these photos! Remain calm, folks... hehehe