flat:vv changed into fixed

# text = 填然鼓之

1	填	塡	VERB	v,動詞,行為,動作	_	3	advmod	_	Gloss=block-up|SpaceAfter=No

2	然	然	VERB	v,動詞,描写,態度	_	1	flat:vv	_	Gloss=like-this|SpaceAfter=No

2	然	然	PART	p,接尾辞,*,*	_	1	fixed	_	Gloss=[suffix]|SpaceAfter=No

3	鼓	鼓	VERB	v,動詞,行為,動作	_	0	root	_	Gloss=drum|SpaceAfter=No

4	之	之	PRON	n,代名詞,人称,止格	_	3	obj	_	Gloss=[3PRON]|SpaceAfter=No