How many seasons?

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Does anyone know how many seasons there are of Reba? I am asking because the other day I saw a few episodes that I have never seen and I thought I saw all of them. It was when Kyra moved back in with reba. In the other episode Van built reba a office in the garage. Which season is that? Maybe there's a whole season that I have not ever seen... or maybe I have missed quite a bit of the episodes and don't even know it. Does anyone know how many episodes there are of Reba?