                     const jo = JSON.parse(result.properties.getProperty(SpeechSDK.PropertyId.SpeechServiceResponse_JsonResult));
                            _.forEach(jo.NBest[0].Words, (word) => {
                                if (word.PronunciationAssessment.ErrorType != "Insertion") {
                                    referenceWords.push(word.Word.toLowerCase());
                                }
                            })
                        } else if (result.reason == SpeechSDK.ResultReaso