one two three four
one two three four !
o̞ n e̞ WORD_BOUNDARY t w o̞ WORD_BOUNDARY t ɾ e̞ e̞ WORD_BOUNDARY f o̞ u ɾ WORD_BOUNDARY
o n e WORD_BOUNDARY t w o WORD_BOUNDARY t h r e e WORD_BOUNDARY f o u r WORD_BOUNDARY ! WORD_BOUNDARY