An experiment aimed at reducing a lost child by a solution for the lost child early stage when I used a prevention of lost child policy and the personal information that I posted position information on because a lot of lost children were protected conducted an investigation at a Japanese beach. As a result, it became clear for a prevention of lost child policy to lead to decrease of a lost child. In addition, it was a solution, and stable solution was enabled in comparison with conventional correspondence in a short time for the lost child early stage.

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