Line sequence in File Adapter

Hi all,
I need to define how does the line sequence of a file has to be created.
For example, I have 3 structures in target mapping side:
struct1 (1..unbounded)
struct2 (1..unbounded)
struct3 (1..1)
Actually, the file is created in this way:
struct1
struct1
struct1
struct2
struct2
struct2
struct3
And in the file that must be created, I need to have this info inside it as this:
struct1
struct2
struct1
struct2
struct1
struct2
struct3
Does anybody know how can I do this with a file receiver adapter?

Thanks Aravind for the reply.
I'm going to try it in that way, but is there a simple way to do this so I don't have to create again all the mapping after changing the DT? I mean if there is a chance to manipulate this in the file receiver adapter with content conversion.
Edit: in the way you told me to do this, I am not able to have the struct3 at the end of the target mapping. I can have it once but in the first one. It is like this:
struct1
struct2
struct3
struct1
struct2
struct1
struct2
struct1
struct2
And I need the struct3 to be at the end of the map.
any idea?

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