;;; Declare and initialize variables
lvars str='Hello,How,Are,You,Today';
;;; Iterate over string
lvars ls = [], i, j = 1;
for i from 1 to length(str) do
    ;;; If comma
    if str(i) = `,` then
       ;;; Prepend word (substring) to list
       cons(substring(j, i - j, str), ls) -> ls;
       i + 1 -> j;
    endif;
endfor;
;;; Prepend final word (if needed)
if j <= length(str) then
    cons(substring(j, length(str) - j + 1, str), ls) -> ls;
endif;
;;; Reverse the list
rev(ls) -> ls;