R. S. Ginzburg, S. S. Khidekel, G. Y. Knyazeva, A. A. Sankin a course in modern english

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In the diagram showing the segmentation of the noun friendliness the lower layer contains the ICs resulting from the first cut, the upper one those from the second, the shaded boxes representing the ICs which are at the same time the UCs of the noun.

The morphemic analysis according to the IC and UC may be carried out on the basis of two principles: the so-called root principle and the affix principle. According to the affix principle the segmentation of the word into its constituent morphemes is based on the identification of an affixational morpheme within a set of words; for example, the identification of the suffixational morpheme -less leads to the segmentation of words like useless, hopeless, merciless, etc., into the suffixational morpheme -less and the root-morphemes within a word-cluster; the identification of the root-morpheme agree- in the words agreeable, agreement, disagree makes it possible to split these words into the root -agree- and the affixational morphemes -able, -ment, dis-. As a rule, the application of one of these principles is sufficient for the morphemic segmentation of words.