What is paralelism and how is it used

Arrange the events below in chronological order. claudius and polonius hide themselves and listen in on hamlet's conversation with ophelia. claudius decides that hamlet's madness is not caused by neglected love and that he is dangerous. rosencrantz and guildenstern tell claudius that they still do not know the cause of hamlet's behavior. polonius suggests that he will hide and listen as the queen talks with hamlet.