um but they are difficult to maintain
um but they are difficult to maintain .
ʌ m WORD_BOUNDARY b ʌ t WORD_BOUNDARY ð eɪ WORD_BOUNDARY ɑː ɹ WORD_BOUNDARY d ɪ f ɪ k ə l t WORD_BOUNDARY t ə WORD_BOUNDARY m eɪ n t eɪ n WORD_BOUNDARY
u m WORD_BOUNDARY b u t WORD_BOUNDARY t h e y WORD_BOUNDARY a r e WORD_BOUNDARY d i f f i c u l t WORD_BOUNDARY t o WORD_BOUNDARY m a i n t a i n WORD_BOUNDARY