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Voice challenges to challenge your voice
the boundary of the limits of the body
How is the boundary made and what is the act to surpass it?
Does it really exist? 

Work is simply done with a machine. It evaluates humans to 00 out of 100
Humans don't cheat on their voices
They sing a song with their own sincerity voice
Voice trying to overcome exceptional moments
It is a challenge to challenge one's own limitations and control it.