tokenize(string-1, string-2?)
The first argument is converted to a string and is treated as a list of separated tokens.
If the second argument is present, any character in string-2 is taken as a delimiter character,
and any sequence of delimiter characters is taken as a token separator. If the second argument
is omitted, any sequence of whitespace is taken as a token separator: or to put it another way,
the default for string-2 is '	

 '.
A new sequence is constructed containing one string for each token; if the string is empty or
contains a separator only then the result will be empty.
For example tokenize("a cup of tea") generates a sequence of four strings:
( "a", "cup", "of", "tea").
This function is deprecated, since the same effect can be achieved
using the tokenize()
function in the standard library.