Task 5.2 Bgp filtering

in this scenario solution says to use community to archieve result.
but what if to use filter-list ?
like this.
on R6 pointing to neighbors on AS 54 :

R6: ( in AS 100)
neighbor x.x.x.x remote-as 54
neighbor x.x.x.x filter-list 1 out

ip as-path access-list 1 permit ^$

thus way i think AS 54 should accept only routes that include only AS 100 in As-path.

comments?

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