谁把中央公园变成了蓝色？(Children detective story)

Ollie Flash strikes again! This time in NYC. The kids in the city
were having a foul time because Central Park was painted blue by
some criminal, and they couldn't play there anymore. The secret
agency asked Ollie to solve the case. Will Ollie and his dog gang
be up to the task and return the kids a pristine Central Park?


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