            "10 [ even? ] pusher [ each ] dip ."
            "V{ 0 2 4 6 8 }"
 }
-{ $notes "Used to implement the " { $link filter } " word." } ;
+{ $notes "Used to implement the " { $link filter } " word. Compare this word with " { $link accumulator } ", which is an unfiltering version." } ;
 
 HELP: trim-head
 { $values

"Using sequences for control flow:"
{ $subsections "sequences-if" }
"For inner loops:"
{ $subsections "sequences-unsafe" } ;

ABOUT: "sequences"


ARTICLE: "sequences-f" "The f object as a sequence"
"The " { $link f } " object supports the sequence protocol in a trivial way. It responds with a length of zero and throws an out of bounds error when an attempt is made to access elements." ;

ARTICLE: "sequences-combinator-implementation" "Implementing sequence combinators"
"Creating a new sequence unconditionally:"
{ $subsections
    accumulator
    accumulator-for
}
"Creating a new sequence conditionally:"
{ $subsections
    pusher
    pusher-for
    2pusher
} ;

ARTICLE: "sequences" "Sequence operations"
"A " { $emphasis "sequence" } " is a finite, linearly-ordered collection of elements. Words for working with sequences are in the " { $vocab-link "sequences" } " vocabulary."
