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Invisible ink

One day a boy came in security agency's office and he was searching something interesting. After 2-3 hours finally he got a invisible ink then he started to write something on a paper with that pen and leave from there. Suddenly an officer came and he get a paper but it was blank so he put it with blank paper. After few days an officer take print out suddenly he got surprise, all paper had printed except that page. So he was tried to again take print on that paper but wasn't working again then he tried to find out what is reason behind it. So, he tried so many ways to find out but he failed every time. 

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