gaga ababa bababa abababa
gaga ababa bababa abababa .
g a g a WORD_BOUNDARY a b a b a WORD_BOUNDARY b a b a b a WORD_BOUNDARY a b a b a b a WORD_BOUNDARY
g a g a WORD_BOUNDARY a b a b a WORD_BOUNDARY b a b a b a WORD_BOUNDARY a b a b a b a WORD_BOUNDARY