en autobús e en tren
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e̞ n WORD_BOUNDARY a u t o̞ β u s WORD_BOUNDARY e̞ WORD_BOUNDARY e̞ n WORD_BOUNDARY t ɾ e̞ n WORD_BOUNDARY
e n WORD_BOUNDARY a u t o b ú s WORD_BOUNDARY e WORD_BOUNDARY e n WORD_BOUNDARY t r e n WORD_BOUNDARY ? WORD_BOUNDARY