Enact a new subrule of Rule 2.3 “Resources, entitled “Costs”, with the following text:

A Cost is an action or payment upon which other actions may be contingent. To Pay a Cost, a Captain carries out the instructions specified by the action that contains that Cost. A Captain cannot Pay a Cost unless they have the means to pay it in full. (For example, a Captain with only 1 Dilithium cannot Pay a Cost of 2 Dilithium.)

Paying Resources is done by removing the indicated Resources from a Captain’s Resources.

The Resource Symbols are {T}, {D}, {G}, {S}, and {A}; and the numerals {0}, {1}, {2}, {3}, {4}, and so on.

There are five Primitive Resource Symbols: {T} is Tritanium, {D} Dilithium, {G} Gold, {S} Silver, and {A} Aluminum. These symbols are used to represent Resources, and also to represent Resources in Costs. Primitive Resource Symbols, in Costs, can be paid only with the corresponding Resource.

Numeral Symbols, such as {1}, represent generic Resources in Costs. Numeral Symbols in Costs can be paid with the specified number of Resources, regardless of the type of Resources used. The symbol {0} represents “zero resources” and is used as a placeholder for a cost that can be paid with no Resources.