use 5.010;
while (<>) {
    my $p = /=/p ? ${^POSTMATCH} : next;
    next if (my $c = <>) =~ /=/p and $p eq ${^POSTMATCH};
    say $_, $c;
}

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In reply to Re: extracting dissimilar lines by trizen
in thread extracting dissimilar lines by anasuya

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