a$ = "2 3 5 7 11 13 17 19 cats 222 -100.2 +11 1.1 +7 7. 7 5 5 3 2 0 4.4 2"

for i = 1 to len(a$)
  a1$ = word$(a$,i)
  if a1$ = "" then exit for
  for i1 = 1 to len(b$)
    if a1$ = word$(b$,i1) then [nextWord]
  next i1
  b$ = b$ + a1$ + " "
[nextWord]
next i

 print "Dups:";a$
 print "No Dups:";b$