[…] there are further limitations of selection among the morphemes, so that not all the sequences provided by the [construction] formulae actually occur. Individual limitations of selection cannot be described in these formulae; at best, the more important among them can be stated in special lists or in the dictionary. Limitations applying to various groups of morphemes in each class can, however, be included if we give our formulae the form of charts. The second dimension which the chart provides enables us to state selections among sub-groups in the several columns (each column representing a position, i.e. a class), by placing along one horizontal line the sequences of sub-groups that actually occur.
- Harris (1946), a pag.178