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# 40d:How do I construct a wall from a particular direction

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It often happens that you need to construct a wall, but your dwarf insists on standing on the wrong side of it during construction, trapping himself.

## Diagonal method

Dwarves will only build walls from a non-diagonally adjacent square.

``` @
@░@ <-- to build this wall, a dwarf will only stand at one of the @ signs
@
```

If you consider this when planning constructions, you can ensure that they are built in the right order:

1. Designate the walls that you want constructed.
2. Find places where the builder might be trapped.
3. Plan a diagonal "escape route" from that area, and qsuspend the tiles along that path.
4. Wait for the non-suspended walls to be built.
5. Un-suspend the suspended walls.

### Example

Suppose you want to build a 3x3 ring of walls, enclosing a central square.

```░░░
░+░
░░░
```

If you designate it all at once, it is possible for the first seven walls to be constructed this way:

```░░░
░@+@
░░░
```

Your builder might stand at either @ sign to finish the last wall, and if he picks the one in the middle, he'll be trapped. If you're unlucky, your first sign that this has happened will be the alert about him starving to death.

However, if you suspend construction of the northeast corner, you'll end up with this:

```  @
░░+@
░+░
░░░
```

This time, both of the places where your builder might stand to finish the last wall are outside of the ring, so you can be confident that he won't be trapped.

## Suspended construction method

1. Press bCw
2. Designate a "temporary" wall to be built in the location where you do not want the dwarf to stand