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I am very confused about this question please help me. Suppose 8 dots are distributed evenly around a circle. In how many ways can you

I am very confused about this question please help me.
Suppose 8 dots are distributed evenly around a circle. In how many ways can you connect the dots with 4 line segments so that the lines do not cross? Shown below are 6 of the ways. Draw the remaining ways. (Hint: Use the Catalan recurrence.) O o O- O

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