Abstract: A computer implemented method for automatic categorization of samples, the method comprising steps a computer is programmed to perform, the steps comprising: on a computer, receiving a plurality of data units, each one of the data units labeling a respective sample of a physical substance, parsing each one of the data units into at least one respective ordered list of one or more specific tokens, for at least one subgroup of the ordered lists, the subgroup consisting of ordered lists of a same number of specific tokens, merging at least two ordered lists in which each pair of specific tokens of a same order of in-ordered-list positioning are at least one of a group consisting of: a pair of identical specific tokens, and a pair of non-identical specific tokens matching a same general token, into an ordered list defining a pattern common to the ordered lists being merged, and categorizing a sample by matching a data unit labeling the sample being categorized, to at least one of a plurality of labeling patterns,