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Only 1 in 5 people manage to solve this riddle quickly: can you find out the name of the father's fourth son?
Only 6% of the population are able to find the 16 circles in this picture
Only 1 out of 10 people can find the dog hiding in the picture - are you one of them?
Only 1 out of 1000 people manage to solve this riddle! Share if you've found the answer