Researchers from a data analysis firm have found that the three most popular combinations -- 1234, 1111, and 0000 -- account for close to 20 per cent of all four-digit passwords. The researchers also found that every four-digit combination that starts with 19 ranks above the 80th percentile in popularity, with those in the upper 1900s coming in the highest. Also quite common are combinations in which the first two digits are between 01 and 12 and the last two are between 01 and 31.
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