A calculator "human relationship calculator" that can know the relationship with the opponent by entering 4 digit's birthday. It is planned to be released from Saturday, March 28th this weekend, but ...
The birthday calculator can tell you fun things about you and the day you were born. For example, if you enter Lifehacker's birthday, January 31st, 2005, we learn that Lifehacker is 0.186692759295499 ...
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