Black box, any component in a system in which only the input and output characteristics are of interest, without regard to its internal mechanism or structure. ref: wikipedia 
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isang kantang nagpapasigla sa akinThis is the first song that truly made an impact in my life. I can’t get enough listening to it. The upbeat tempo makes me want to sing and jump up and down. The lyric captured what I am feeling, when I accepted Christ... more
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