If the solution in

my earlier node doesn't return what you want, this surely will:

`use Math::BigInt ();
*gcd = \&Math::BigInt::bgcd;
sub embiggen {
local $_ = @_ ? $_[0] : $_;
return Math::BigInt->new($_);
}
my @a = ( 10, 20, 33, 45, 60 );
my @b = ( 2, 5, 10, 12, 16, 23, 45 );
# my %a = map { $_ => 1 } @a;
# my %b = map { $_ => 1 } @b;
#
# my @c = map embiggen,
# grep { !$b{$_} }
# @a;
#
# my @d = map embiggen,
# map { Math::BigInt->new($_) }
# grep { !$a{$_} }
# @b;
my @c = @a;
my @d = @b;
foreach my $c (@c) {
foreach my $d (@d) {
my $gcd = gcd($c, $d);
$c /= $gcd;
$d /= $gcd;
}
}
@c = grep { $_ != 1 } @c;
@d = grep { $_ != 1 } @d;
`

or this messier but potentially faster alternative:

`use Math::BigInt ();
use Math::Big::Factors ();
*gcd = \&Math::BigInt::bgcd;
*factor = \&Math::Big::Factors::factors_wheel;
sub embiggen {
local $_ = @_ ? $_[0] : $_;
return Math::BigInt->new($_);
}
my @a = ( 10, 20, 33, 45, 60 );
my @b = ( 2, 5, 10, 12, 16, 23, 45 );
# my %a = map { $_ => 1 } @a;
# my %b = map { $_ => 1 } @b;
#
# my @c = map embiggen,
# grep { !$b{$_} }
# @a;
#
# my @d = map embiggen,
# grep { !$a{$_} }
# @b;
my @c = @a;
my @d = @b;
my %c_factors;
foreach my $c_idx (0..$#c) {
my @c_factors = factor($c[$c_idx]);
foreach my $c_factor (@c_factors) {
push(@{$c_factors{$c_factor}}, $c_idx);
}
}
foreach my $d (@d) {
my @d_factors = factor($d);
foreach my $d_factor (@d_factors) {
next unless $c_factors{$d};
next unless @{$c_factors{$d}};
my $c_idx = shift(@{$c_factors{$d}});
$c[$c_idx] /= $d_factor;
$d /= $d_factor;
}
}
@c = grep { $_ != 1 } @c;
@d = grep { $_ != 1 } @d;
`

Both untested.

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