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When two edges are already marked with "x" in L-shape as in this figure, let's think about the vertex placed diagonally from the L-shape corner. |
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A line comes from either top or left edge to the star marked vertex,
so it extends to one of the remaining edge (right/bottom).
This part is same as the case of "3" (rule of drawing a line out of a corner of "3" when two lines are already connected in L-shape). |
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| Drawing a line out of a corner of "1" when two "x" are already marked in L-shape | |
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This is the opposite of the rule of drawing a line to a corner of "1".
This is not so useful by itself, but is very helpful in the following cases:
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