Formal notations for the handling of sound laws in historical linguistics have been employed by linguists for a long time. So far, however, linguists have barely tried to describe their notation practices formally. As a result, a lot of variation can be found in the practice of sound law notation. This specification can be seen as a first attempt to provide an exhaustive documentation for a particular sound law notation scheme. This notation scheme accompanies an online-tool in which sound laws can be applied to actual words in order to test the consequences of sound change in practice.

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