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Using digital way to could increase the identification of the
design because it coud combine the numbers in every way.
Different people have their own digital disign (a birthday or
anniversary number, etc.) which helps them remember their
marks, use digital combination can also reduce the probability
coincides with the others. 0-10 can be combine at random, which
improve the recognition, also reduce waste.
XI'AN UNIVERSITY OF SCIENCE AND TECHNOLOGY