Question: How do I plot a square?

I've been trying to figure this out for the life of me and I keep getting an error somewhere. I'm trying to set it up so I have values for all four sides so I've used an array of variables to assign the values.. ie: [0,1] [1,1] [1,0] [0,0] but when i try and combine all of these in the plot, I get an error. Any help would greatly be apperciated. Thanks!
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