Long discussion of spurious reductions. The paper is now too long.

TODO

@@ -20,6 +20,8 @@
     then look for a blank line, higher up, between two sentences.
     explain the meaning of the spurious reductions warning (sometimes missing!)
     --compile-errors could warn about messages wider than 80 columns
+    --on-error-reduce should warn about arguments which are not names of terminal symbols
+      and should remove any spaces in the names!
     could also warn statically about out-of-range $i?
   document the workflow
   remove lr.csv when done