Computational tools may return only partial AAMs that, in particular, do not represent hydrogen atoms. While hydrogens can usually be suppressed safely in structural formula because simple valency rules imply the missing hydrogens, this is no longer true for subgraphs of the ITS. In particular, if only the reaction center extracted from a partial AAM is known, the reattachment of hydrogens cannot be unambiguously determined. As a consequence, without a complete representation of the reaction mechanism, deriving comprehensive mechanistic insights from "hydrogen-less" fragments of the ITS becomes challenging. Moreover, hydrogens that take part in the reaction must be present in reactant molecules, necessitating their inclusion in the reaction rules of a chemical rewriting system such as MØD. We, therefore, strive to extract the most information-rich representation of the ITS patterns.