So keep checking at least on a weekly basis.
1	So	so	ADV	RB	_	2	advmod	2:advmod	_
2	keep	keep	VERB	VB	Mood=Imp|VerbForm=Fin	0	root	0:root	_
3	checking	check	VERB	VBG	VerbForm=Ger	2	xcomp	2:xcomp	_
4	at	at	ADP	IN	_	5	case	5:case	_
5	least	least	ADJ	JJS	Degree=Sup	8	obl	8:obl:at	_
6	on	on	ADP	IN	_	9	case	9:case	_
7	a	a	DET	DT	Definite=Ind|PronType=Art	9	det	9:det	_
8	weekly	weekly	ADJ	JJ	Degree=Pos	9	amod	9:amod	_
9	basis	basis	NOUN	NN	Number=Sing	3	obl	3:obl:on	SpaceAfter=No
10	.	.	PUNCT	.	_	2	punct	2:punct	_
