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How I solved it?

Id Lesson SAS R SAS Video R Video
TASKS_HIS_L1001Identify the overlap of dates in exposure intervals
TASKS_HIS_L1003Get the latest transfusion date on or before each lab collection date
TASKS_HIS_L1004Last dosing date before an adverse event start date
TASKS_HIS_L1005Check if an element start date is same as previous element end date in SE
TASKS_HIS_L1006Change from previous non-missing result
TASKS_HIS_L1007Filter all records of subjects with a duplicate record in ADSL
TASKS_HIS_L1008Compare a table output dataset after removing spaces
TASKS_HIS_L1009Check if at least one dose of a concomitant medication is taken within study treatment period