  The author has recently introduced the class of CNED sets in Euclidean space,
generalizing the classical notion of NED sets, and shown that they are
quasiconformally removable. A set $E$ is CNED if the conformal modulus of a
curve family is not affected when one restricts to the subfamily intersecting
$E$ at countably many points. We prove that several classes of sets that were
known to be removable are also CNED, including sets of $\sigma$-finite
Hausdorff $(n-1)$-measure and boundaries of domains with $n$-integrable
quasihyperbolic distance. Thus, this work puts in common framework many known
results on the problem of quasiconformal removability and suggests that the
CNED condition should also be necessary for removability. We give a new
necessary and sufficient criterion for closed sets to be (C)NED. Applying this
criterion, we show that countable unions of closed (C)NED sets are (C)NED.
Therefore we enlarge significantly the known classes of quasiconformally
removable sets.

Complex Variables;Classical Analysis and ODEs;Dynamical Systems