again 26 bad luck date, Kutai Bridge collapsed on 26 November

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Understand this is superstitious to trust 26 of the month as bad luck day. However, people always relate this 26 with natural disasters or incidents..Started from Aceh Tsunami, Situ Gintung disasters and yesterday again the collapse of Tenggarong bridge was also occurred on 26th of November. Personally, I never believe this kind of superstitious but many people relate the bad luck date and make people aware on every 26 of the month, since something really bad can be happened..what do you think? Is this just co incidents or has relation with those bad number?