The data category series terminator 'FINI' must subsequently be used, if necessary, to terminate the series of Data Categories 6, 7, 8, 9, and 10. The program expects the number of data categories input to be equal to the number of structures defined. If this is not the case, the last data category input must be followed by a FINI data category series terminator. For example, if the user has three structures and wishes to omit the data for Structure 2 from Data Category 9, the remaining data categories (9.1 and 9.3) must be followed by the data category terminator 'FINI'. If the user omits data for Structures 1 and 2 then the only remaining data category (9.3) must be followed by the data category terminator 'FINI'. However, if all Data Category 9’s are omitted, the data category keyword 'NONE' must be used to indicate that there is no input for any of the defined structures (see also Compulsory Data Category Keyword).