diff --git a/example/edit_distance/AsciiString.h b/example/edit_distance/AsciiString.h
index 957fa16c..43136d2b 100644
--- a/example/edit_distance/AsciiString.h
+++ b/example/edit_distance/AsciiString.h
@@ -149,6 +149,17 @@ class AsciiString : public scheduler::SchedulerKeeper<schedulerId> {
     return data_[i];
   }
 
+  frontend::Int<true, 8, true, schedulerId, usingBatch> operator[](
+      frontend::Int<false, maxWidth, true, schedulerId, usingBatch> i) {
+    frontend::Int<true, 8, true, schedulerId, usingBatch> ret(0, 0);
+    for (size_t j = 0; j < maxWidth; j++) {
+      frontend::Int<false, maxWidth, false, schedulerId, usingBatch> indexInInt(
+          j);
+      ret = ret.mux(indexInInt == i, data_[j]);
+    }
+    return ret;
+  }
+
   AsciiString<maxWidth, isSecret, schedulerId, usingBatch> toUpperCase() const;
   AsciiString<maxWidth, isSecret, schedulerId, usingBatch> toLowerCase() const;
 
diff --git a/example/edit_distance/AsciiString_impl.h b/example/edit_distance/AsciiString_impl.h
index ab88d67f..52c76c79 100644
--- a/example/edit_distance/AsciiString_impl.h
+++ b/example/edit_distance/AsciiString_impl.h
@@ -289,9 +289,7 @@ AsciiString<
     usingBatch>
 AsciiString<maxWidth, isSecret, schedulerId, usingBatch>::concat(
     const AsciiString<otherMaxWidth, isSecretOther, schedulerId, usingBatch>&
-        other) const {
-  throw std::runtime_error("Unimplemented");
-}
+        other) const {}
 
 template <int maxWidth, bool isSecret, int schedulerId, bool usingBatch>
 template <bool isSecretChoice, bool isSecretOther>
diff --git a/example/edit_distance/test/AsciiStringTest.cpp b/example/edit_distance/test/AsciiStringTest.cpp
index 743a6033..210957cf 100644
--- a/example/edit_distance/test/AsciiStringTest.cpp
+++ b/example/edit_distance/test/AsciiStringTest.cpp
@@ -251,64 +251,29 @@ TEST(AsciiStringTest, testMuxBatch) {
   }
 }
 
-TEST(AsciiStringTest, testPrivateSize) {
+TEST(AsciiStringTest, testObliviousIndex) {
   scheduler::SchedulerKeeper<0>::setScheduler(
       std::make_unique<scheduler::PlaintextScheduler>(
           scheduler::WireKeeper::createWithUnorderedMap()));
   using SecAsciiString = AsciiString<15, true, 0>;
+  using PubAsciiString = AsciiString<15, false, 0>;
 
-  int partyId = 0;
-
-  std::random_device rd;
-  std::mt19937_64 e(rd());
-  std::uniform_int_distribution<char> dist1('a', 'z');
-  std::uniform_int_distribution<size_t> strLength(1, 15);
-
-  for (size_t i = 0; i < 100; i++) {
-    auto len = strLength(e);
-    std::string v1 = randomString(dist1, e, len);
-
-    SecAsciiString secStr1(v1, partyId);
-
-    auto r1 = secStr1.privateSize<16>();
-
-    EXPECT_EQ(r1.openToParty(partyId).getValue(), v1.size());
-  }
-}
-
-TEST(AsciiStringTest, testPrivateSizeBatch) {
-  scheduler::SchedulerKeeper<0>::setScheduler(
-      std::make_unique<scheduler::PlaintextScheduler>(
-          scheduler::WireKeeper::createWithUnorderedMap()));
-  using SecBatchAsciiString = AsciiString<15, true, 0, true>;
-
-  int partyId = 0;
-  size_t batchSize = 9;
-
-  std::random_device rd;
-  std::mt19937_64 e(rd());
-  std::uniform_int_distribution<char> dist1('a', 'z');
-  std::uniform_int_distribution<size_t> strLength(1, 15);
-
-  for (size_t i = 0; i < 100; i++) {
-    std::vector<std::string> v1(batchSize);
-
-    for (size_t j = 0; j < batchSize; j++) {
-      auto len = strLength(e);
-      v1[j] = randomString(dist1, e, len);
-    }
-
-    SecBatchAsciiString secStr1(v1, partyId);
-
-    auto r1 = secStr1.privateSize<16>();
-
-    std::vector<size_t> expectedValue(batchSize);
-    for (size_t j = 0; j < batchSize; j++) {
-      expectedValue[j] = v1[j].size();
-    }
+  std::string s1 = "Foo";
+  std::string s2 = "Testing";
 
-    testVectorEq(r1.openToParty(partyId).getValue(), expectedValue);
+  PubAsciiString v1(s1);
+  SecAsciiString v2(s2, 1);
+
+  for (size_t i = 0; i < 15; i++) {
+    frontend::Int<false, 15, true, 0> privateIndex(i, 0);
+    if (i < s1.size())
+      EXPECT_EQ((int64_t)s1[i], v1[privateIndex].openToParty(0).getValue());
+    else
+      EXPECT_EQ(0, v1[privateIndex].openToParty(0).getValue());
+    if (i < s2.size())
+      EXPECT_EQ((int64_t)s2[i], v2[privateIndex].openToParty(1).getValue());
+    else
+      EXPECT_EQ(0, v2[privateIndex].openToParty(1).getValue());
   }
 }
-
 } // namespace fbpcf::edit_distance