R O robot robot robot
r o robot robot robot .
r WORD_BOUNDARY o WORD_BOUNDARY r o b o t WORD_BOUNDARY r o b o t WORD_BOUNDARY r o b o t WORD_BOUNDARY
r WORD_BOUNDARY o WORD_BOUNDARY r o b o t WORD_BOUNDARY r o b o t WORD_BOUNDARY r o b o t WORD_BOUNDARY . WORD_BOUNDARY