SB allows you to put a variable after NEXT, which does nothing but can make code easier to read:
FOR I=0 TO 3 ... NEXT IBasically, NEXT accepts an optional argument, which is normally meant to be a variable, but since it never gets used, you can pass numbers or strings as well I discovered this bug(?) when trying to do
... NEXT@LABEL ...which seems like it should work (based on the highlighting), but actually, the label is never created because it is "eaten" by NEXT (since labels are actually just strings)