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perl -lne 'undef $a if($.%7==0);$a.=$_;if($.%6==0 ||(eof)){$a=~s/\;$//;print $a};'

Success #stdin #stdout 0.03s 5348KB

stdin

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Apr 24 2014;
is;
a;
sample;
;
Jun 24 2014 123;
may 25 2014;
is;
b;
sample;
;
Dec 21 2014 987

stdout

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Apr 24 2014;is;a;sample;;Jun 24 2014 123
may 25 2014;is;b;sample;;Dec 21 2014 987

https://ideone.com/jmaWjV

language:

Bash (bash 5.0.3)

created:

visibility:

secret

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