aku bisa O aku bisa
aku bisa o aku bisa .
a k u WORD_BOUNDARY b i s a WORD_BOUNDARY o WORD_BOUNDARY  a k u WORD_BOUNDARY b i s a WORD_BOUNDARY
a k u WORD_BOUNDARY b i s a WORD_BOUNDARY o WORD_BOUNDARY a k u WORD_BOUNDARY b i s a WORD_BOUNDARY