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NEW YORK — Just when the New York Knicks looked whole, they will not be for at least another month. The team announced Sunday that forward Bill Walker will miss 4-6 weeks after he undergoes a surgical procedure known as “debridement” on his left elbow on Monday. Debridement is a term used to describe the removal of lacerated, devitalized, or contaminated tissue. Walker has started eight games for the Knicks, scoring a season-high 21 points when he knocked down seven 3-pointers in a loss