on es un tren
on es un tren ?
o n̺ WORD_BOUNDARY ɛ s̺ WORD_BOUNDARY u̯ n̺ WORD_BOUNDARY t̪ ɾ̺ ɛ n̺ WORD_BOUNDARY
o n WORD_BOUNDARY e s WORD_BOUNDARY u n WORD_BOUNDARY t r e n WORD_BOUNDARY ? WORD_BOUNDARY