u1 u1 u1 u1 u1 u1
u1 u1 u1 u1 u1 u1
sfp sfp sfp sfp sfp sfp
u1 u1 u1 u1 u1 u1 .
u˥ WORD_BOUNDARY u˥ WORD_BOUNDARY u˥ WORD_BOUNDARY u˥ WORD_BOUNDARY u˥ WORD_BOUNDARY u˥ WORD_BOUNDARY
u 1 WORD_BOUNDARY u 1 WORD_BOUNDARY u 1 WORD_BOUNDARY u 1 WORD_BOUNDARY u 1 WORD_BOUNDARY u 1 WORD_BOUNDARY . WORD_BOUNDARY