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Singapore is well known for its tough laws (and penalties for flouting them). Now it has a new ally in the fight against chewing gum, littering and bigger misdemeanors. The country has started testing a robot named Xavier. Over the next three weeks, Xavier robots will monitor the crowds of Singapore's Toa Payoh Central to look for what the nation's authorities describe as "undesirable social behaviors" -- including any group of people. The country's current COVID-19 safety measure forbids congregations of more than five people. To gauge the crowds, Xavier models have cameras that create 360-degree views.