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Using lines helps to show that there is a covalent bond because it represents the sharing of electrons while dots represent lone pairs of electrons in covalent bonds. In ionic bonds, you do not use lines because there is no sharing of electrons.
Lone pairs are represented as dots, so I think it makes a diagram more clear if the bonds are drawn as lines. However, you can draw them as dots if that makes more sense to you or if it helps you understand the structure better.
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