How many common port walls do my box have?

I have a normal L ported box with a port on the left side of the front with the sub on the right side of the top. The port goes back then to the right. There isn't no 45 in the corner or anything. Can anybody tell me how many common port walls it has? I'm thinking it has 2 but am not 100 percent sure. Thanks

Update:

twosick718, The box with 3 common port walls doesnt look like it has a piece going to right that is connected to the port like mine. Does that make a difference?

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