instruction: what is the one thing patient 006-81423 was diagnosed with until 2104 for the first time?
response: SELECT diagnosis.diagnosisname FROM diagnosis WHERE diagnosis.patientunitstayid IN (SELECT patient.patientunitstayid FROM patient WHERE patient.patienthealthsystemstayid IN (SELECT patient.patienthealthsystemstayid FROM patient WHERE patient.uniquepid = '006-81423')) AND STRFTIME('%y', diagnosis.diagnosistime) <= '2104' ORDER BY diagnosis.diagnosistime LIMIT 1