bool has_empty_tree() const { return this->wakeup_tree_.empty(); }
std::string string_of_wut() const { return this->wakeup_tree_.string_of_whole_tree(); }
bool has_empty_tree() const { return this->wakeup_tree_.empty(); }
std::string string_of_wut() const { return this->wakeup_tree_.string_of_whole_tree(); }