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Twin Sisters Productions has published two sets of "Write-on Wipe-off" educational workbooks for preschoolers based on Sesame Street. The first set, released in 2010, is softbound in a standard workbook (8 x 10.5 inches) format, 16 pages long, and includes a dry erase marker. The other set of "Play-n-Learn" books, released in 2011, are spiral bound flip books (4 x 11 inches), which are also 16 pages long.