Static 

In this method, we have a Lookup table; it consists of all possible substitutions for a given set of inputs. This Lookup table can be visualized like this:

 

This table illustrates how a Lookup table can be constructed for substituting source text with a different text. This method scales well when there is a predefined quantity of substitutions available.

Another example of this Lookup table-based substitution is when we follow a naming standard for country codes, for example, ISO-8661: