du1 du1 du1 du1 du1
du1 du1 du1 du1 du1
on on on on on
du1 du1 du1 du1 du1 .
t u˥ WORD_BOUNDARY t u˥ WORD_BOUNDARY t u˥ WORD_BOUNDARY t u˥ WORD_BOUNDARY t u˥ WORD_BOUNDARY
d u 1 WORD_BOUNDARY d u 1 WORD_BOUNDARY d u 1 WORD_BOUNDARY d u 1 WORD_BOUNDARY d u 1 WORD_BOUNDARY . WORD_BOUNDARY