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LONDON, UK - Viewers and judges on Britain's Got Talent were perplexed on Friday night when Irish schoolboy magician Cillian O'Connor vanished during his performance in the live semi-final. Cillian, who has Autism, took the stage and millions of viewers' screens for the final live semi-final and again used judge Simon Cowell as part of his act. Cillian requested that Simon write a random word on a handker