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Spas Zdravkov Spasov, the cre­ator of this work and the copy­right hold­er of it pub­lish it here un­der the fol­low­ing li­cense:

This ma­te­r­i­al (file, con­tent) is dis­trib­uted un­der the li­cense Cre­ative Com­mons At­tri­bu­tion 4.0 In­ter­na­tion­al

CC BY 4.0

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