Look for a sharp change with no streaking or smearing between black and white areas. jhjjhjkhjhkjhhjh

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kdhkjbcjfjffjfjgdgdghgdjgdjfjgfjgfjf kdhkjbcjfjffjfjgdgdghgdjgdjfjgfjgfjf kdhkjbcjfjffjfjgdgdghgdjgdjfjgfjgfjf kdhkjbcjfjffjfjgdgdghgdjgdjfjgfjgfjf

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