1. Look at where triangle of blacks is getting formed.
2. If 1 is given number, try to find the probable position of 1 and then mark the other remaining boxes as white.
3. When 3 is coming in 3x2 rectangle then 2 boxes at the center sides will always be white.
4. If 3 is coming in 3x2 rectangle at the edge, then see that these 3 black boxes are not forming a isolated area.
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