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The molecules are normally written in an order where the atom with the lone pair is right next to the atom that receives it. Thus, because oxygen has the lone pairs in a H20 molecule, you would write it 0H2 if the atom that receives the electrons is to the left of the water molecule (such as when drawing the Lewis structure).
It doesn't really matter as the implication is the same yet it depends on the location. You would want the lewis dot structure to agree with the model. For example you would typically put the line to Oxygen of H2O since Oxygen is able to be bonded.
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