diff --git a/pkg/urbit/include/jets/k.h b/pkg/urbit/include/jets/k.h
index 7d6329c56..19eab297d 100644
--- a/pkg/urbit/include/jets/k.h
+++ b/pkg/urbit/include/jets/k.h
@@ -5,7 +5,9 @@
   /** Tier 1.
   **/
     u3_noun u3ka_add(u3_noun a, u3_noun b);
+    u3_noun u3ka_div(u3_noun a, u3_noun b);
     u3_noun u3ka_sub(u3_noun a, u3_noun b);
+    u3_noun u3ka_mod(u3_noun a, u3_noun b);
     u3_noun u3ka_mul(u3_noun a, u3_noun b);
     u3_noun u3ka_gth(u3_noun a, u3_noun b);
     u3_noun u3ka_lte(u3_noun a, u3_noun b);
@@ -18,6 +20,10 @@
 
 /* u3kc: tier 3 functions
 */
+  u3_noun
+  u3kc_con(u3_noun a,
+           u3_noun b);
+
   /* u3kc_mix(): binary xor.
   */
     u3_noun
diff --git a/pkg/urbit/jets/a/div.c b/pkg/urbit/jets/a/div.c
index fa2853160..c9e95de1d 100644
--- a/pkg/urbit/jets/a/div.c
+++ b/pkg/urbit/jets/a/div.c
@@ -44,3 +44,13 @@
       return u3qa_div(a, b);
     }
   }
+
+
+u3_noun
+u3ka_div(u3_noun a,
+         u3_noun b)
+{
+  u3_noun c = u3qa_div(a, b);
+  u3z(a); u3z(b);
+  return c;
+}
diff --git a/pkg/urbit/jets/a/mod.c b/pkg/urbit/jets/a/mod.c
index 80c8923ca..af9f6662b 100644
--- a/pkg/urbit/jets/a/mod.c
+++ b/pkg/urbit/jets/a/mod.c
@@ -41,3 +41,12 @@
       return u3qa_mod(a, b);
     }
   }
+
+u3_noun
+u3ka_mod(u3_noun a,
+         u3_noun b)
+{
+  u3_noun c = u3qa_mod(a, b);
+  u3z(a); u3z(b);
+  return c;
+}
diff --git a/pkg/urbit/jets/c/con.c b/pkg/urbit/jets/c/con.c
index cf25e4033..746cd7942 100644
--- a/pkg/urbit/jets/c/con.c
+++ b/pkg/urbit/jets/c/con.c
@@ -49,3 +49,12 @@
       return u3qc_con(a, b);
     }
   }
+
+u3_noun
+u3kc_con(u3_noun a,
+         u3_noun b)
+{
+  u3_noun c = u3qc_con(a, b);
+  u3z(a); u3z(b);
+  return c;
+}
diff --git a/pkg/urbit/jets/e/scow.c b/pkg/urbit/jets/e/scow.c
index 4627c3079..f0d57778b 100644
--- a/pkg/urbit/jets/e/scow.c
+++ b/pkg/urbit/jets/e/scow.c
@@ -55,7 +55,9 @@ static
 u3_noun
 _print_da(u3_atom cor, u3_atom raw_da)
 {
+  u3l_log("about to cook");
   u3_noun hok = u3j_cook("u3we_scow_print_da", u3k(cor), "yore");
+  u3l_log("cooked");
   u3_noun yod = u3n_slam_on(hok, u3k(raw_da));
 
   u3_noun out = 0;
@@ -221,14 +223,17 @@ _print_ud(u3_atom ud)
   int between = 0;
   u3_atom list = 0;
 
+  u3k(ud);
+
   do {
     if (between == 3) {
       list = u3nc('.', list);
       between = 0;
     }
-    list = u3nc(u3qa_add(u3qa_mod(u3k(ud), 10), '0'), list);
+
+    list = u3nc(u3ka_add(u3ka_mod(ud, 10), '0'), list);
     between++;
-    ud = u3qa_div(ud, 10);
+    ud = u3ka_div(ud, 10);
   } while (c3n == u3r_sing(ud, 0));
 
   return list;
@@ -252,8 +257,8 @@ u3we_scow(u3_noun cor)
     case c3__da:
       return _print_da(cor, atom);
 
-    case 'p':
-      return _print_p(atom);
+    /* case 'p': */
+    /*   return _print_p(atom); */
 
     case c3__ud:
       return _print_ud(atom);
@@ -271,6 +276,7 @@ u3we_scow(u3_noun cor)
 u3_noun
 u3we_scot(u3_noun cor)
 {
+  /* u3l_log("u3we_scot"); */
   u3_noun mod;
   u3_noun atom;
 
@@ -292,11 +298,15 @@ u3we_scot(u3_noun cor)
     /*   return u3qc_rap(3, x); */
     /* } */
 
-    case 'p':
-      return u3qc_rap(3, _print_p(atom));
+    /* case 'p': */
+    /*   return u3qc_rap(3, _print_p(atom)); */
 
-    case c3__ud:
-      return u3qc_rap(3, _print_ud(atom));
+    case c3__ud: {
+      u3_atom tape = _print_ud(atom);
+      u3_atom ret = u3qc_rap(3, tape);
+      u3z(tape);
+      return ret;
+    }
 
     default:
       return u3_none;
diff --git a/pkg/urbit/jets/e/slaw.c b/pkg/urbit/jets/e/slaw.c
index 9476d004d..97b35a573 100644
--- a/pkg/urbit/jets/e/slaw.c
+++ b/pkg/urbit/jets/e/slaw.c
@@ -307,8 +307,8 @@ _parse_p(u3_noun txt) {
     numname = cur[0] - '0';                         \
     cur++;                                          \
     while (isdigit(cur[0])) {                       \
-      numname = u3qa_mul(numname, 10);              \
-      numname = u3qa_add(numname, cur[0] - '0');    \
+      numname = u3ka_mul(numname, 10);              \
+      numname = u3ka_add(numname, cur[0] - '0');    \
       cur++;                                        \
     }                                               \
   } while (0)
@@ -323,8 +323,8 @@ _parse_p(u3_noun txt) {
     numname = cur[0] - '0';                         \
     cur++;                                          \
     while (isdigit(cur[0])) {                       \
-      numname = u3qa_mul(numname, 10);              \
-      numname = u3qa_add(numname, cur[0] - '0');    \
+      numname = u3ka_mul(numname, 10);              \
+      numname = u3ka_add(numname, cur[0] - '0');    \
       cur++;                                        \
     }                                               \
   } while (0)
@@ -435,13 +435,15 @@ _parse_da(u3_noun cor, u3_noun txt) {
 
     if (cur[0] == 0) {
       c3_free(c);
-      list = u3qb_flop(list);
+
+      u3_noun flopped = u3qb_flop(list);
+      u3z(list);
 
       u3_noun hok = u3j_cook("u3we_slaw_parse_da", u3k(cor), "year");
       u3_noun res = u3n_slam_on(hok,
                                 u3nt(u3nc(bc, year), month,
                                      u3nc(day,
-                                          u3nq(hour, minute, second, list))));
+                                          u3nq(hour, minute, second, flopped))));
       return u3nc(0, res);
     }
 
@@ -498,8 +500,8 @@ u3we_slaw(u3_noun cor)
     case c3__da:
       return _parse_da(cor, txt);
 
-    case 'p':
-      return _parse_p(txt);
+    /* case 'p': */
+    /*   return _parse_p(txt); */
 
     case c3__ud:
       return _parse_ud(txt);
diff --git a/pkg/urbit/jets/tree.c b/pkg/urbit/jets/tree.c
index 5b91e9595..6c24820cd 100644
--- a/pkg/urbit/jets/tree.c
+++ b/pkg/urbit/jets/tree.c
@@ -1298,7 +1298,7 @@ static c3_c* _141_tri_shal_ha[] = {
 
 static u3j_core _141_tri_d[] =
 { { "qua",  3, 0, _141_qua_d, _141_qua_ha, _141_qua_ho },
-  { "ob",   3, 0, _141_tri__ob_d, 0 },
+  //  { "ob",   3, 0, _141_tri__ob_d, 0 },
   { "cofl", 7, 0, _141_tri__cofl_d, _141_tri__cofl_ha },
   { "rd",   7, 0, _141_tri__rd_d, _141_tri__rd_ha },
   { "rs",   7, 0, _141_tri__rs_d, _141_tri__rs_ha },