还 没 还 没
hai2 mei2 hai2 mei2
adv adv adv adv
还 没 还 没 .
x ai̯ ˧˥ WORD_BOUNDARY m ei̯ ˧˥ WORD_BOUNDARY x ai̯ ˧˥ WORD_BOUNDARY m ei̯ ˧˥ WORD_BOUNDARY 
还 WORD_BOUNDARY 没 WORD_BOUNDARY 还 WORD_BOUNDARY 没 WORD_BOUNDARY