Subpatents are a system introduced in 1919 NE by the Western Sector
government to allow companies to easily license the rights to patents
as if they owned the patent.

Subpatent names are formatted as `IMPORTANCE-SECTOR-SECTIONS-NUMBER`.

`IMPORTANCE` may be one of:

- `V` / Vital :: Important in all circumstances
- `E` / Essential :: Important during galaxy-wide emergency
- `N` / Normal :: Important during shortages
- `X` / Extraneous :: Not vital in any circumstance

`SECTOR` may be the abbreviation of any sector. Common are `E` and `W`
for East and West.

`SECTIONS` is a `/` separated list of sections, which may be:

- `FO` :: Flooring
- `MA` :: Materials

`NUMBER` is the number of the subpatent, which is a linearly
increasing integer starting at 1. The number is used to discriminate
subpatents with the same importance/sector/sections fields.

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