Question: Can I make a circular list or a set?

Greetings to all,

I want to make a "circular" list but I cannot find a way.

To be more precise, let K=[x1,x2,x3,x4], is any way to set K[0]:=K[4] and K[5]:=K[1]?

 

Thanx a lot,

Giorgos

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