diff --git a/Makefile b/Makefile
index 8aaceb10fe..4ccd5bb4ae 100644
--- a/Makefile
+++ b/Makefile
@@ -447,7 +447,8 @@ J164_4_OFILES=\
        gen164/4/by_gas.o \
        gen164/4/by_get.o \
        gen164/4/by_has.o \
-       gen164/4/by_put.o 
+       gen164/4/by_put.o \
+       gen164/4/by_uni.o
 
 J164_5_OFILES=\
        gen164/5/cue.o \
diff --git a/gen164/4/by.c b/gen164/4/by.c
index f4bcd2e37e..d06a45a79b 100644
--- a/gen164/4/by.c
+++ b/gen164/4/by.c
@@ -11,6 +11,7 @@
   extern u2_ho_jet j2_mcj(Pt4, by, get)[];
   extern u2_ho_jet j2_mcj(Pt4, by, has)[];
   extern u2_ho_jet j2_mcj(Pt4, by, put)[];
+  extern u2_ho_jet j2_mcj(Pt4, by, uni)[];
 
 /* structures
 */
@@ -20,6 +21,7 @@
     { j2_sc(Pt4, by, get), j2_mcj(Pt4, by, get), 0, 0, u2_none },
     { j2_sc(Pt4, by, has), j2_mcj(Pt4, by, has), 0, 0, u2_none },
     { j2_sc(Pt4, by, put), j2_mcj(Pt4, by, put), 0, 0, u2_none },
+    { j2_sc(Pt4, by, uni), j2_mcj(Pt4, by, uni), 0, 0, u2_none },
     {}
   };
 
diff --git a/gen164/4/by_has.c b/gen164/4/by_has.c
index aa4dbae69f..b39abf1a8e 100644
--- a/gen164/4/by_has.c
+++ b/gen164/4/by_has.c
@@ -20,7 +20,7 @@
       u2_noun pn_a, qn_a;
 
       if ( (u2_no == u2_as_trel(a, &n_a, &l_a, &r_a)) ||
-           (u2_no == u2_as_cell(n_a, &pn_a, &qn_a) ) )
+           (u2_no == u2_as_cell(n_a, &pn_a, &qn_a)) )
       {
         return u2_bl_bail(wir_r, c3__exit);
       }
diff --git a/gen164/4/by_uni.c b/gen164/4/by_uni.c
new file mode 100644
index 0000000000..8f38db2e40
--- /dev/null
+++ b/gen164/4/by_uni.c
@@ -0,0 +1,56 @@
+/* j/4/uni.c
+**
+** This file is in the public domain.
+*/
+#include "all.h"
+#include "../pit.h"
+
+/* functions
+*/
+  u2_weak                                                         //  transfer
+  j2_mcc(Pt4, by, uni)(u2_wire wir_r,
+                       u2_noun a,                                 //  retain
+                       u2_noun b)                                 //  retain
+  {
+    if ( u2_nul == b ) {
+      return u2k(a);
+    }
+    else {
+      u2_noun l_b, n_b, r_b;
+      u2_noun pn_b, qn_b;
+
+      if ( (u2_no == u2_as_trel(b, &n_b, &l_b, &r_b)) ||
+           (u2_no == u2_as_cell(n_b, &pn_b, &qn_b)) )
+      {
+        return u2_bl_bail(wir_r, c3__exit);
+      }
+      else {
+        u2_noun l = j2_mcc(Pt4, by, uni)(wir_r, a, l_b);
+        u2_noun r = j2_mcc(Pt4, by, uni)(wir_r, l, r_b);
+        u2_noun z = j2_mcc(Pt4, by, put)(wir_r, r, pn_b, qn_b);
+
+        u2z(l); u2z(r);
+        return z;
+      }
+    }
+  }
+  u2_weak                                                         //  transfer
+  j2_mc(Pt4, by, uni)(u2_wire wir_r,
+                      u2_noun cor)                                //  retain
+  {
+    u2_noun a, b;
+
+    if ( u2_no == u2_mean(cor, u2_cv_sam, &b, u2_cv_con_sam, &a, 0) ) {
+      return u2_bl_bail(wir_r, c3__exit);
+    } else {
+      return j2_mcc(Pt4, by, uni)(wir_r, a, b);
+    }
+  }
+
+/* structures
+*/
+  u2_ho_jet
+  j2_mcj(Pt4, by, uni)[] = {
+    { ".2", c3__lite, j2_mc(Pt4, by, uni), u2_jet_test|u2_jet_live, u2_none, u2_none },
+    { }
+  };