In the rule “The Building”, remove the text “Possible building contents are shown in the list below: W: Wood. A reliable building material. S: Stone. A sturdy but very heavy building material. -: Empty.”

Create a subrule called “Building Contents” with the text:

The possible building contents for The Building, known as Materials, are listed in the table below. The ruleset may refer to a given Material using either its Name or Abbreviated Name - they are considered equivalent. The Description is flavour text.

If Engineers have a numerical publicly tracked variable with the same name as a Material, they are said to have that amount of the Material - otherwise, they are said to have 0 of that Material and are not capable of spending it.

Name | Abbreviated Name | Description
Empty | _ | This represents open space.
Wood | W | A reliable building material.
Stone | S | A sturdy but very heavy building material.

Throughout the Build atomic action in the rule The Building, replace each hyphen with an underscore.

In the rule “The Building”, replace “Optionally choose any W in the Building Contents and chose a replacement item from the list of the possible building contents that is not W or -. If they choose this option, the Engineer must first spend 1 of a publicly-tracked variable associated with that Engineer such that this variable is a legal value after the spend and the action of this spending would allow the Engineer to use 1 of the replacement item. If they do, they may then replace the W in the Building Contents with the replacement item.” if it exists, with:

Optionally, by spending 1 from any of their Materials except Wood or Empty, they may choose any W in the Building Contents and replace it with the spent Material.

From the rule “The Quarry”, remove the text “Whenever an Engineer spends 1 of their Stone in the manner described in the Build atomic action, they are able to use 1 S as a replacement item in that same action.” if it exists.