diff --git a/src/fst/affixes/verb_middle_affixes.lexc b/src/fst/affixes/verb_middle_affixes.lexc
index eea576b..47bc3d3 100644
--- a/src/fst/affixes/verb_middle_affixes.lexc
+++ b/src/fst/affixes/verb_middle_affixes.lexc
@@ -513,6 +513,45 @@ LEXICON Filter-DO-IO
 
 LEXICON Filter-DO-IO-Checks
 
+@U.OBJECTPERSON.REFL@                                   Filter-DO-IO-Refl;
+@U.OBLIQUEPERSON.REFL@                                  Filter-DO-IO-Refl;
+@U.OBJECTPERSON.RECIP@                                  Filter-DO-IO-Recip;
+@U.OBLIQUEPERSON.RECIP@                                 Filter-DO-IO-Recip;
+@D.OBJECTPERSON.REFL@@D.OBLIQUEPERSON.REFL@@D.OBJECTPERSON.RECIP@@D.OBLIQUEPERSON.RECIP@       Filter-DO-IO-Other;
+
+LEXICON Filter-DO-IO-Refl
+
+! Make sure that at most one reflexive or reciprocal form appears as a direct
+! object or indirect object (i.e., no DObj.REFL/RECIP-IObj.REFL/RECIP
+! combinations)
+!
+! TODO: In theory, there might be contexts in which REFL-RECIP (e.g., 'they
+! fed themselves to each other') and RECIP-REFL (e.g., 'they fed each other
+! to themselves') might be plausible. For now, we exclude those forms from
+! being produced/accepted, since they tend to be semantically odd for most
+! ditransitive verbs.
+@U.OBJECTPERSON.REFL@@U.OBLIQUEPERSON.1@                    #;
+@U.OBJECTPERSON.REFL@@U.OBLIQUEPERSON.2@                    #;
+@U.OBJECTPERSON.REFL@@U.OBLIQUEPERSON.3@                    #;
+@U.OBJECTPERSON.REFL@@U.OBLIQUEPERSON.4@                    #;
+@U.OBLIQUEPERSON.REFL@@U.OBJECTPERSON.1@                    #;
+@U.OBLIQUEPERSON.REFL@@U.OBJECTPERSON.2@                    #;
+@U.OBLIQUEPERSON.REFL@@U.OBJECTPERSON.3@                    #;
+@U.OBLIQUEPERSON.REFL@@U.OBJECTPERSON.4@                    #;
+
+LEXICON Filter-DO-IO-Recip
+
+@U.OBJECTPERSON.RECIP@@U.OBLIQUEPERSON.1@                   #;
+@U.OBJECTPERSON.RECIP@@U.OBLIQUEPERSON.2@                   #;
+@U.OBJECTPERSON.RECIP@@U.OBLIQUEPERSON.3@                   #;
+@U.OBJECTPERSON.RECIP@@U.OBLIQUEPERSON.4@                   #;
+@U.OBLIQUEPERSON.RECIP@@U.OBJECTPERSON.1@                   #;
+@U.OBLIQUEPERSON.RECIP@@U.OBJECTPERSON.2@                   #;
+@U.OBLIQUEPERSON.RECIP@@U.OBJECTPERSON.3@                   #;
+@U.OBLIQUEPERSON.RECIP@@U.OBJECTPERSON.4@                   #;
+
+LEXICON Filter-DO-IO-Other
+
 ! Only provide paths out of this lexicon for ditransitive forms whose direct
 ! object-oblique object combinations are semantically plausible.