Stockham was able to discern several distinct erasures and even determined the order of erasure. While at Canterbury, some interpolations were made; this required some erasures in the manuscript. The deinterlever at the succeeding stage distributes these erasures across 28 D2 codewords. An ordinary soft pencil eraser could quickly produce perfect erasures on this kind of paper. Ultra-violet light is used to verify erasures by scribes. Justice Ian Josephson described the erasures as "unacceptable negligence". And in case of more than 1 error, this decoder outputs 28 erasures. Many of the blocks have no erasures on multiple sides. The erasures were subsequently repaired by Seti II's agents. These complaints led to studies of the alleged erasures. Lifespan is estimated at 50,000 erasures. Some of the erasures the "tlacuilo" made are still evident. These are constructed by filming a drawing, making erasures and changes, and filming it again. Erasures, misspellings or grave grammatical errors in a rescript render its authenticity suspected. If more than 4 erasures were to be encountered, 24 erasures are output by D2.