We have explained in our article Biblical Formatting located on the world wide web at http://www.Rashiyomi.com/biblicalformatting.pdf, that the Biblical Author indicates bold, italics, underline by using repetition. In other words if a modern author wanted to emphasize a word they would either underline, bold or italicize it. However when the Biblical author wishes to emphasize a word He repeats it. The effect - whether thru repetition or using underline - is the same. It is only the means of conveying this emphasis that is different.

With this in mind let us read verse Lv13-35:36 which discusses leprous symptoms appearing after the two week examination and review process: But if the patch spread spread over the skin after his cleansing; Then ...he is unclean. Using the formatting principle presented at the beginning of this example, Rashi perceives this repeated word spread spread the same way a modern reader would see an underlined word: But if the patch spread over the skin after his cleansing; Then ...he is unclean. The underlined word, spread indicates an unspecified emphasis. Rashi interprets this unspecified emphasis: Spreading always confers a status of ritual impurity. He is unclean whether the spreading happened before or after the two week examination and review process.