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Sure enough , the ammonia-based latex could be painted on Grand Central 's walls , allowed to dry , and then peeled off like putty , taking with it the dirt and clay particles , thus restoring the imitation Caen stone 's gilded tint . May be repeated if topics differ , on approval of adviser . Such requests may be denied if the employee 's absence substantially impacts operational needs of the unit / department . Native files must be created under PC DOS . To my knowledge , many of those plans have not been approved as I write this . It is understood that a specific request may be denied if operational needs will not allow the employee 's absence .