Table 1: Index structure (example).
(a)

WordOccurrence in file

Ice4, 17, 54, …
Cream17, 98, 109, …
Dessert2, 17, 234, …

(b)

File no.WordOccurrence in lines

4Ice967, 1201
17Desert32, 2378
17Cream567, 1201, 1456
17Dessert1201