Page 519: Description of the meaning of fnd in find(s, fnd) is missing from the paragraph before the table.

[WraithGlade]

Notice that the preceding paragraph never describes what "fnd" means:

In this table, s, s1, and s2 are strings; p is an element comparison predicate; rgx is a regular expression; and n is an integral value.

[JLospinoso]

Thanks, @WraithGlade!