Each of the following series of records consists of a four-digit primary key (with no duplicates) and a four-character secondary key (with many duplicates)....

Each of the following series of records consists of a four-digit primary key (with no duplicates) and a four-character secondary key (with many duplicates).

(a) Show the inverted list (as illustrated by Figure 10.4) for this collection of records. (b) Show the improved inverted list (as illustrated by Figure 10.5) for this collection of records.

Figure 10.4

Figure 10.5