brr brr brr brr
brr brr brr brr
on on on on
brr brr brr brr .
β r WORD_BOUNDARY β r WORD_BOUNDARY β r WORD_BOUNDARY β r WORD_BOUNDARY
b r r WORD_BOUNDARY b r r WORD_BOUNDARY b r r WORD_BOUNDARY b r r WORD_BOUNDARY . WORD_BOUNDARY