WORDPOS(phrase,string[,position])

This is a word-oriented version of POS. It returns the word number of
the first occurrence of the phrase in the string. If "position" is
specified, the the search starts at the specified word number instead
of the beginning.  If phrase contains no words, then 0 is returned.
   phrase is a sequence of blank-delimited words which must be present
in sequence in the string and match exactly, except that multiple
blanks between words are treated as single blanks, and leading and
trailing blanks are ignored.
   This function replaces the FIND function from VMREXX.