sshd-core/src/main/java/org/apache/sshd/client/auth/BuiltinUserAuthFactories.java [97:118]:
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    public static ParseResult parseFactoriesList(Collection<String> factories) {
        if (GenericUtils.isEmpty(factories)) {
            return ParseResult.EMPTY;
        }

        List<UserAuthFactory> resolved = new ArrayList<>(factories.size());
        List<String> unknown = Collections.emptyList();
        for (String name : factories) {
            UserAuthFactory c = resolveFactory(name);
            if (c != null) {
                resolved.add(c);
            } else {
                // replace the (unmodifiable) empty list with a real one
                if (unknown.isEmpty()) {
                    unknown = new ArrayList<>();
                }
                unknown.add(name);
            }
        }

        return new ParseResult(resolved, unknown);
    }
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sshd-core/src/main/java/org/apache/sshd/server/auth/BuiltinUserAuthFactories.java [99:120]:
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    public static ParseResult parseFactoriesList(Collection<String> factories) {
        if (GenericUtils.isEmpty(factories)) {
            return ParseResult.EMPTY;
        }

        List<UserAuthFactory> resolved = new ArrayList<>(factories.size());
        List<String> unknown = Collections.emptyList();
        for (String name : factories) {
            UserAuthFactory c = resolveFactory(name);
            if (c != null) {
                resolved.add(c);
            } else {
                // replace the (unmodifiable) empty list with a real one
                if (unknown.isEmpty()) {
                    unknown = new ArrayList<>();
                }
                unknown.add(name);
            }
        }

        return new ParseResult(resolved, unknown);
    }
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