One at a time.
1	One	one	NUM	CD	NumForm=Word|NumType=Card	0	root	0:root	Bridge=78<136|Discourse=mode-manner:114->113:0|Entity=(136-person-acc:inf-cf1-1-sgl)
2	at	at	ADP	IN	_	4	case	4:case	_
3	a	a	DET	DT	Definite=Ind|PronType=Art	4	det	4:det	Entity=(137-time-new-cf2-2-sgl
4	time	time	NOUN	NN	Number=Sing	1	obl	1:obl:at	Entity=137)|SpaceAfter=No
5	.	.	PUNCT	.	_	1	punct	1:punct	_
