how to flaten a list ?

I have list like this.

[ ] as cluster and ( ) as index

[0]

(0)Line1

(1)Line2

(2)Line3

(3)Line4

[1]

(0)Line1

(1)Line2

and after I flaten this list it become like this.

(0)Line1

(1)Line2

(2)Line3

(3)Line4

(4)Line5

(5)Line6

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