1. A system comprising: a first machine configured to transmit a header and a corresponding unstructured description; and a second machine in at least selective communication with the first machine, the second machine configured to, receive the header and the unstructured description, determine relevant state values and irrelevant state values for a set of tokens in the unstructured description based on the header, indicate as most relevant a sequence of tokens based, at least in part, on the relevant state values of the sequence of tokens and the irrelevant state values of those of the set of tokens outside of the sequence of tokens.