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Three Part (Carbonless) – Three Sheets are printed one 105 gsm paper and other two on 60-70 gsm paper on A4 sheet . The bottom of first sheet, the top and bottom of second sheet and the top of third sheet is chemically treated so that the impression of the first sheet should come on the second and third sheets.
===Errors===
It is possible for optical answer sheets to be printed incorrectly, such that all ovals will be read as filled. This occurs if the outline of the ovals is too thick, or is irregular. During the [[2008 U.S. presidential election]], this occurred with over 19,000 [[absentee ballot]]s in the [[Georgia (U.S. state)|Georgia]] county of [[Gwinnett County|Gwinnett]], and was discovered after around 10,000 had already been returned. The slight difference was not apparent to the [[naked eye]], and was not detected until a test run was made in late October. This required all [[ballot]]s to be transferred to correctly printed ones, by [[:wikt:sequester|sequestered]] workers of the [[board of elections]], under close [[observation]] by members of the [[Democrat (US)|Democrat]]ic and [[Republican (US)|Republican]] (but not [[third party (politics)|other]]) political parties, and county [[sheriff]] [[Deputy sheriff|deputies]]. The transfer, by law, could not occur until [[Election Day (politics)|election day]] (November 4).{{citation needed|date=January 2013}}
==OMR software==
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