We need to explain.  We have two of these sets, in their original envelopes.  One has been opened and one is still sealed, so we don’t verify what’s inside.  The six basic cards, of which you see three in the scan, are very high-quality real-photo cards captioned in Chinese and English, and with significant explanations of natural phenomena on the reverses.  The reason we need to explain is because the open set also includes one more unused card, calligraphy we can’t read at all, with no English caption or explanation.  We do not know if this card was added to the opened pack later, or if it would also appear in the sealed pack.  Therefore one set has seven cards and the other may only have six, we don’t know.  There you go.  Both sets are the same price and both sets are Grade: 1.