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foreach $i (@f) {
        @e = grep {$_ % $i != 0}  @n;
        @n = ();
        @n = @e;
}

foreach $i (@f) {
  @n = grep {$_ % $i != 0} @n;
}

foreach $i (@f) {
  @n = grep {$_ % $i != 0 || $_ == $i} @n;
}