An expert proposed working criteria for selecting files to destroy, e.g., duplicates, nonsense, useless. For instance, one can do automated detection of bug duplicates or automatic bug fixing. This can lead to lost invoices, human error during data entry, and invoice duplicates. In the episode, Bender duplicates himself into two smaller copies in order to avoid work. European domino sets contain neither suit distinctions nor the duplicates that went with them. This results in polyploid cells or, if the chromosomes duplicates repeatedly, polytene chromosomes. Arthur copies Ralph's insecurities and starts making duplicates of Ralph. Many plant species are the result of hybridization, combined with polyploidy, which duplicates the chromosomes. The ruling also gave people the ability to make duplicates of their documents. At least two vintage duplicates of Sputnik 1 exist, built apparently as backup units. Trevor has developed a method for creating exact human duplicates. For example, an XY cell undergoing mitosis duplicates its chromosomes, becoming XXYY. The forms on Earth are imperfect duplicates of the intellectual celestial ideas. Most commonly, a single spermatozoon duplicates and fertilises an empty ovum. Negative prints allow, in principle, unlimited duplicates of the positive print to be made.