I have a four columns Input like
address 1 address 2 address 3 address 4
Null L1 L2 L3
L1 L2 L3 Null
L1 Null L2 L3
L1 L2 Null L3
Output Required
address 1 address 2 address 3 address 4
L1 L2 L3 Null
L1 L2 L3 Null
L1 L2 L3 Null
L1 L2 L3 Null
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