+HELP: subseq-as
+{ $values { "from" "a non-negative integer" } { "to" "a non-negative integer" } { "seq" sequence } { "exemplar" sequence } { "subseq" "a new sequence" } }
+{ $description "Outputs a new sequence consisting of all elements starting from and including " { $snippet "from" } ", and up to but not including " { $snippet "to" } " of type " { $snippet "exemplar" } "." }
+{ $errors "Throws an error if " { $snippet "from" } " or " { $snippet "to" } " is out of bounds." } ;
+