Can you translate the listing to english please? The google translate fail to translate the most important part of listing. If I've understand it, you should found 5 consecutive GC codes? However, they must be numbers or can be either numbers or letters? I.e.
GC1234A, GC1234B, GC1234C etc?
Also, there are some letters that are never used in the GC codes - i.e. the I, the S and maybe others. So the sequence
GC1234G, GC1234H, GC1234J is also valid?
To be verified the list of unused letters.