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One end of the ruler tilted slightly,makes it easy to grab or pick up it.
Generally, all the parts of a ruler is straight,makes it more difficult to grab or pickup it.Especially,when someone just finished cut her or his fingenails, this kind of situation is more difficult.So make one end of the ruler tilted slightly,we can grab or pick up it more easily,even if the one who just finished cut her or his fingenails.