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my $atom = Atom->new(Z=> 80, coords => [V(0,0,0), V(1,1,1), V(2,2,2)]) +;
package MyMVR; #ABSTRACT: Moose subclass of Math::Vector::Real ... __PACKAGE__->meta->make_immutable; 1;
use MyMVR; ... my $b = MyMVR->new(1,1,1); print $_ ."\n" foreach (@{$a - $b});