Question on lookup files


I would like to know what exactly is the lookup files for the shhh.flows
I opened it with wordpad, but i don’t understand how it is useful for the command

Could you help me please ??

Thanks in advance

Read this…

Quince C, Lanzén A, Curtis TP, Davenport RJ, Hall N, Head IM, Read LF, Sloan WT (2009). Accurate determination of microbial diversity from 454 pyrosequencing data. Nat. Methods 6:639.