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RE: [Contest] 💰💰💰 Daily steemit contest....#2 💰💰💰
I think it will be 'Echo'
Because sound have not seen.. Echo is a reflection of sounds.. And in all places Echo can't be produce..when we are in front of a big wall or in a enclosed room, then the reflected sound forms 'Echo'.. Until we do different sound Echo' doesn't form automatically..