bubu bubu bubu bubu
bubu bubu bubu bubu .
b ɯ b ɯ WORD_BOUNDARY b ɯ b ɯ WORD_BOUNDARY b ɯ b ɯ WORD_BOUNDARY b ɯ b ɯ WORD_BOUNDARY
b u b u WORD_BOUNDARY b u b u WORD_BOUNDARY b u b u WORD_BOUNDARY b u b u WORD_BOUNDARY