A card edge connector includes an insulative housing, a number of electrical contacts, and a pair of latch members. Values of information symbols are estimated utilizing parity samples that are generated from the parity symbols. Angular backlash between the inner race and the outer race may result in variations in the timing of the media sheets. Thereby, the density unevenness stemming from the error in conveyance occur in positions which are different between the first and second colors, Thus, it possible to make the overall density unevenness less obvious by making gradients of variations in brightness and chroma of an image smaller. A corresponding LDIF fragment is determined, which need not be different from the LDIF fragment to which the first LDIF entry was written.