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When we tie our shoelace, we always ignore balancing the left length and the right length at first, so we find that one side of shoelace is so long but the other side of shoelace is too short at last, therefore we have to adjust and take this boring job again, its incovenient. This design offers a good solution: There is a mark in the middle of the shoelace, so when you tie this shoelace, you will make the mark stay in the middle between two lace-holes and then you can continue to tie your shoelace, how convenient it is!