sch sch sch sch
sch sch sch sch .
 ɛ s ts eː h ɑː WORD_BOUNDARY  ɛ s ts eː h ɑː WORD_BOUNDARY  ɛ s ts eː h ɑː WORD_BOUNDARY  ɛ s ts eː h ɑː WORD_BOUNDARY
s c h WORD_BOUNDARY s c h WORD_BOUNDARY s c h WORD_BOUNDARY s c h WORD_BOUNDARY