lesson 2 of 4 · joins and label windows without leakagejoins and time windows without leakagelesson 2 of 4 · joins and label windows without leakagejoins and time windows without leakagelesson 2 of 4 · joins and label windows without leakagejoins and time windows without leakagelesson 2 of 4 · joins and label windows without leakagejoins and time windows without leakagelesson 2 of 4 · joins and label windows without leakagejoins and time windows without leakagelesson 2 of 4 · joins and label windows without leakagejoins and time windows without leakagelesson 2 of 4 · joins and label windows without leakagejoins and time windows without leakagelesson 2 of 4 · joins and label windows without leakagejoins and time windows without leakagelesson 2 of 4 · joins and label windows without leakagejoins and time windows without leakagelesson 2 of 4 · joins and label windows without leakagejoins and time windows without leakagelesson 2 of 4 · joins and label windows without leakagejoins and time windows without leakage
Fill in the comparison operator that keeps features strictly BEFORE the label month (the cutoff must be excluded).
Operator: