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# What is making the third vertical wall in the dungeon?

I'm not stuck on the assignment (Building the Game: Part 2, where we complete the Dungeon game), just really puzzled.

I get that we've made the left and center row tiles equal to:

|_ or |X, depending on whether there's nothing or the player in that cell.

And I get that we've made the far-right wall with the else part of that statement into:

_| or X|, depending on whether there's nothing or the player in that cell.

But what in the world is making the third of the fourth walls in each row of this ASCII map? By my logic, it should look like this as only some boxes have a left wall and the far-right column does not have a left wall:

| _ | _ _| | _ | _ _| | _ | _ _|

Can someone help me wrap my head around this? I'm sure it's something really obvious and I'm not entirely sure why this even bothers me so much.

The tile is always `|{}`. For left or center, if the player is there, we use `.format()` to put in an `X`. If they're not, we put in `_`. For the rightmost column, if the player is there, we put in `X|`. If they're not, `_|`. So the right ends up being either `|X|` or `|_|`. That's what draws the right column's left wall.