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Thank you so much, It works, you're the best!
And what about if I have three linee to concatenate
BEFORE
First
Fourth
Seventh
Second
Fifth
Eighth
Third
Sixth
Ninth

AFTER
First Second third
Fourth Fifth Sixth
Seventh Eighth ninth

Really Thank you for your time!

Hi! I have to append multiple lines but these are not consecutive.
BEFORE

AAAA BBBB
1111 11111
2222 22222
5555 55555

AFTER
AAAA BBBB 2222 2222
1111 1111 5555 5555

Thank you so much!!