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Utrjevanje znanja poznavanja elementov. viri: https://almiracatovic.wordpress.com/2016/12/29/zen-zgodba-diamant/ https://www.facebook.com/840538736008263/photos/a.964972963564839/1155639677831499/ https://www.myloancare.in/gold-rate-india/ https://www.wur.nl/en/activity/Maximization-of-sulfur-formation-in-the-presence-of-organic-sulfur-compounds-in-a-dual-bioreactor-gas-desulfurization-system-1.htm https://www.finance.si/8820922/Baker-bo-poceni-se-vsaj-nekaj-let