How many female users were surveyed in the mental health survey for 2017 in the state of Nebraska?
AnswerText = 'Yes' where questiontext = 'Do you have a family history of mental illness?'; AnswerText = 'Female' where questionid = 2; AnswerText = 'Nebraska' where questionid = 4
SELECT COUNT(*) FROM ( SELECT T2.UserID FROM Question AS T1 INNER JOIN Answer AS T2 ON T1.questionid = T2.QuestionID INNER JOIN Survey AS T3 ON T2.SurveyID = T3.SurveyID WHERE T3.Description = 'mental health survey for 2017' AND T1.questionid = 2 AND T2.AnswerText = 'Female' UNION SELECT T2.UserID FROM Question AS T1 INNER JOIN Answer AS T2 ON T1.questionid = T2.QuestionID INNER JOIN Survey AS T3 ON T2.SurveyID = T3.SurveyID WHERE T1.questionid = 4 AND T2.AnswerText = 'Nebraska' AND T3.Description = 'mental health survey for 2017' )