--13-- 
down to any desired leve~. Table (i) is linked to tables 
(4), (5), (6), and (7), and tables (4), (5), and (6) are 
linked either directly back to table (I) or indirectly 
through table (8) and then table (3) back to table (i). 
Thus, access to any piece of information in these data 
tables is gained by simple table lookup. 
In view of the variability in the number of words in 
each part-of--speech and semantic class, and in the number 
of governing probabilities, hypernyms, ser~ntic classes 
and dependents associated with each word, we have packed 
these data in large arrays as illustrated in tables (i), 
(3), (4), (5), (6), and (7). The advantages are (i) 
reduction in storage requirements, and (ii) capacity for 
rapid selection of a word from a part of speech or a 
sen~ntic class. The disadvantage is that we have placed 
a restriction on the amount of additional data that may 
be added to the existing lists. To avoid modifying the 
program when new data are added, indices (such as x, y, 
and z in Fig. i) to the reserved spaces in tables (I), (3), 
and (7) are n~de input parametecs to the program. At 
present the parameters are set to leave space for expansion 
of input data. Further expansion can be handled simply by 
readjusting the input parameters.