on and off on and off
on and off on and off
adv coord adv adv coord adv
on and off on and off.
ɔ n WORD_BOUNDARY æ n d WORD_BOUNDARY ɔ f WORD_BOUNDARY ɔ n WORD_BOUNDARY æ n d WORD_BOUNDARY ɔ f WORD_BOUNDARY
o n WORD_BOUNDARY a n d WORD_BOUNDARY o f f WORD_BOUNDARY o n WORD_BOUNDARY a n d WORD_BOUNDARY o f f . WORD_BOUNDARY