ar ar ar ar ar
ar ar ar ar ar.
ɑ ɹ WORD_BOUNDARY ɑ ɹ WORD_BOUNDARY ɑ ɹ WORD_BOUNDARY ɑ ɹ WORD_BOUNDARY ɑ ɹ WORD_BOUNDARY
a r WORD_BOUNDARY a r WORD_BOUNDARY a r WORD_BOUNDARY a r WORD_BOUNDARY a r . WORD_BOUNDARY