The r_und_s package decodes the german 'R- und S-Satze', which
are numerically coded security advice for chemical substances
into plain text. This is, e.g., used to compose security sheets
or lab protocols and especially useful for students of
chemistry. There are four packages, giving texts in German,
English, French and Dutch.

Homepage:
https://ctan.org/pkg/r-und-s
