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esta aqu esta aqui .
ɛ ʃ t ɐ WORD_BOUNDARY ɐ k u WORD_BOUNDARY ɛ ʃ t ɐ WORD_BOUNDARY ɐ k i WORD_BOUNDARY
e s t a WORD_BOUNDARY a q u WORD_BOUNDARY e s t a WORD_BOUNDARY a q u i WORD_BOUNDARY