 
 HELP: value-at*
 { $values { "value" object } { "assoc" assoc } { "key/f" "the key associated to the value, or " { $link f } } { "?" boolean } }
-{ $description "Looks up the key associated with a value. The boolean flag can decide beteen the case of a missing key, and a key of " { $link f } "." } ;
+{ $description "Looks up the key associated with a value. The boolean flag can decide between the case of a missing key, and a key of " { $link f } "." } ;
 
 HELP: value-at
 { $values { "value" object } { "assoc" assoc } { "key/f" "the key associated to the value, or " { $link f } } }

{ $values
     { "assoc" assoc } { "quot" { $quotation "( ... key value -- ... newkey newvalue )" } } { "exemplar" assoc }
     { "newassoc" assoc } }
{ $description "Applies the quotation to each entry in the input assoc and collects the results in a new assoc of the stame type as the exemplar." }
{ $examples { $example "USING: prettyprint assocs hashtables math ;" " H{ { 1 2 } { 3 4 } } [ sq ] { } assoc-map-as ." "{ { 1 4 } { 3 16 } }" } } ;

HELP: extract-keys

     { "key" object } { "alist" "an array of key/value pairs" }
     { "pair/f" "a key/value pair" } { "i/f" integer } }
{ $description "Iterates over " { $snippet "alist" } " and stops when the key is matched or the end of the " { $snippet "alist" } " has been reached. If there is no match, both outputs are " { $link f } "." }
{ $notes "This word is used to implement " { $link at* } " and " { $link set-at } " on sequences, and should not be called directly." }
{ $examples { $example "USING: prettyprint assocs.private kernel ;"
                        "3 { { 1 2 } { 3 4 } } search-alist [ . ] bi@"
                       "{ 3 4 }\n1"
