ei2 ei2 ei2 ei2
ei2 ei2 ei2 ei2
co co co co
ei2 ei2 ei2 ei2 .
ei˧˥ WORD_BOUNDARY ei˧˥ WORD_BOUNDARY ei˧˥ WORD_BOUNDARY ei˧˥ WORD_BOUNDARY
e i 2 WORD_BOUNDARY e i 2 WORD_BOUNDARY e i 2 WORD_BOUNDARY e i 2 WORD_BOUNDARY . WORD_BOUNDARY