The last paragraph in the section on Roget’s Thesaurus discusses ways in which both Figure 7.7 and Figure 7.10 could be improved by adding more words, etc. Perform these improvements. With respect to the plus operator in RT: the interface will not actually allow you to modify the number of times the plus operator is applied. But you can conduct separate searches for all of the words in Figure 7.10 and then manually combine all of the data into one formal context to achieve one further application of the plus operator.