"Here is an array containing the " { $link f } " class:"
{ $example "{ POSTPONE: f } ." "{ POSTPONE: f }" }
"The " { $link f } " object is an instance of the " { $link f } " class:"
-{ $example "USE: classes" "f class ." "POSTPONE: f" }
+{ $example "USE: classes" "f class-of ." "POSTPONE: f" }
"The " { $link f } " class is an instance of " { $link word } ":"
-{ $example "USE: classes" "\\ f class ." "word" }
+{ $example "USE: classes" "\\ f class-of ." "word" }
"On the other hand, " { $link t } " is just a word, and there is no class which it is a unique instance of."
{ $example "t \\ t eq? ." "t" }
"Many words which search collections confuse the case of no element being present with an element being found equal to " { $link f } ". If this distinction is important, there is usually an alternative word which can be used; for example, compare " { $link at } " with " { $link at* } "." ;