@Override
    public List<String> getSuggestions(CommandInvocation invocation)
    {
        List<String> result = new ArrayList<>();
        String token = invocation.currentToken().toLowerCase();
        for (String key : getFixedValues())
        {
            if (key.startsWith(token))
            {
                result.add(key);
            }
        }
        return result;
    }