NOTE: Patients with T-cell disease who are within 4 months of completing delayed intensification I chemotherapy and have not received interim maintenance II chemotherapy with escalating IV methotrexate or delayed intensification II chemotherapy receive a course of interim maintenance chemotherapy and delayed intensification II chemotherapy according to the augmented regimen. If these patients have received interim maintenance II chemotherapy with escalating IV methotrexate, they receive delayed intensification II chemotherapy according to the augmented regimen. These patients also receive cranial irradiation starting on day 28 of delayed intensification II chemotherapy and then proceed to maintenance therapy.