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my @foo = qw/a b c d e f g/;
for my $x (@foo) {
    push @foo, 'd' if $x eq 'd';
    print $x;
}

push @foo, map {$_ eq 'd' ? 'd' : ()} @foo;
print for @foo;

for (@foo) {
  print;
  shift(@foo) if $_ eq 'c';
}
print "\n@foo\n";