*/
    Collection<Phase> phases();

    /**
     * Stream of phases containing all child phases recursively.
     */
    default Stream<Phase> allPhases() {
        return phases().stream().flatMap(Phase::allPhases);
    }

    /**
     * Collection of aliases.
     */
    Collection<Alias> aliases();

    /**
     * Pre-ordered list of phases.

        return phases;
    }

    static Map<String, LifecyclePhase> getDefaultPhases(org.apache.maven.api.Lifecycle lifecycle) {
        Map<String, List<String>> goals = new HashMap<>();
        lifecycle.allPhases().forEach(phase -> phase.plugins()
                .forEach(plugin -> plugin.getExecutions().forEach(exec -> exec.getGoals()
                        .forEach(goal -> goals.computeIfAbsent(phase.name(), n -> new ArrayList<>())

        Graph graph = new Graph();
        lifecycle.phases().forEach(phase -> addPhase(graph, null, null, phase));
        List<String> allPhases = graph.visitAll();
        Collections.reverse(allPhases);
        List<String> computed =
                allPhases.stream().filter(s -> !s.startsWith("$")).collect(Collectors.toList());
        List<String> given = lifecycle.orderedPhases().orElse(null);

        public List<Lifecycle.Phase> phases() {
            return phases;
        }

        @Override
        public Stream<Lifecycle.Phase> allPhases() {
            return Stream.concat(Stream.of(this), phases().stream().flatMap(Lifecycle.Phase::allPhases));
        }
    }

    static class DefaultAlias implements Lifecycle.Alias {
        private final String v3Phase;
        private final String v4Phase;