udu u dudu dudu
udu u dudu dudu .
u d̪ u WORD_BOUNDARY u WORD_BOUNDARY d̪ u d̪ u WORD_BOUNDARY d̪ u d̪ u WORD_BOUNDARY
u d u WORD_BOUNDARY u WORD_BOUNDARY d u d u WORD_BOUNDARY d u d u WORD_BOUNDARY . WORD_BOUNDARY