20K10 2 Ulm factors Ulm subgroups 2 almost \(\omega_1\)-\(p^{\omega+n}\)-projective groups 2 almost \(p^{\omega+n}\)-projective groups 2 countable subgroups 2 nice subgroups 2 strongly almost \(\omega_1\)-\(p^{\omega+n}\)-projective groups 2