Question: How to find order of element of group in Maple?

Exercise: Find all the elements of order 2 in D30 .

I set the D30 group , but I do not know how to calculate and list elements of order 2 . I thought of calculating the order of all the elements ( With PermOrder () command , perhaps) , and then use the select command to select those with order of 2. But the big problem is to calculate the order of elements.

I know only calculate the order of the group. Could anyone help me ?

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