a burrín a burrín a burrín
a burrín a burrín a burrín !
a WORD_BOUNDARY β u r i n WORD_BOUNDARY a WORD_BOUNDARY β u r i n WORD_BOUNDARY a WORD_BOUNDARY β u r i n WORD_BOUNDARY
a WORD_BOUNDARY b u r r í n WORD_BOUNDARY a WORD_BOUNDARY b u r r í n WORD_BOUNDARY a WORD_BOUNDARY b u r r í n WORD_BOUNDARY ! WORD_BOUNDARY