A stapler is incorporated in a finishing device associated with a document creating apparatus. For example, a user activity system may receive user activity data from the mobile device. Each node of the data structure is determined based on a weighted sum of values of one or more pixels in the upsampled image. Each output is independent from the other outputs, and can be used to read data from a different address at a different time using a different clock signal. The lancet device utilizes the multi-lancet unit and includes a body and a holding member which houses the multi-lancet unit.