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Thanks to both for your answers. Sorry my delay to answer. The solution for the author issue was excelent, both solutions, now I have two options. Thanks again!
However the solution about tags was not usefull to me, but it was because I don't explained it well.
I have a group of tags, topA, topB, topC, topD and topE. Of course each books also have his own tags (novel, mistery, erotic, history, etc.). I created a virtual library where I only have books that have all the tags of my group (topA, topB... ), however I want to create a virtual library where group books with, at least, 3 of 5 tags from my group.
By example, one book with topA, topC, topD, topE; another book with tagB,tagC, tagE; another book with topA, topB, topC, topD...
I hope I was able to explain better now. So, how can I do this, if it's possible?
Sorry my grammar, i use Google translate to fix some mistakes in my grammar
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