// Get a map of registration statuses
Map<String, Boolean> registered;
try {
registered = m.areUsersRegistered(new HashSet<>(ns.getList("number")));
} catch (IOException e) {
System.err.println("Unable to check if users are registered");
// Get a map of registration statuses
Map<String, Boolean> registered;
try {
registered = m.areUsersRegistered(new HashSet<>(ns.getList("number")));
} catch (IOException e) {
System.err.println("Unable to check if users are registered");