buta+buta+buu+buu
buta buta buu buu .
b ɯ t a WORD_BOUNDARY b ɯ t a WORD_BOUNDARY b ɯː WORD_BOUNDARY b ɯː WORD_BOUNDARY
b u t a WORD_BOUNDARY b u t a WORD_BOUNDARY b u u WORD_BOUNDARY b u u WORD_BOUNDARY