public Builder clearQuestionIdToAnswer() {
            copyOnWrite();
            instance.getMutableQuestionIdToAnswerMap()
                    .clear();
            return this;
        }
<code>map&lt;int64, string&gt; question_id_to_answer = 1;</code>
turms-client-kotlin/src/main/java/im/turms/client/model/proto/request/group/enrollment/CheckGroupJoinQuestionsAnswersRequest.java