diff --git a/examples/str_exam.cpp b/examples/str_exam.cpp
index bdfe12d..a924f9c 100644
--- a/examples/str_exam.cpp
+++ b/examples/str_exam.cpp
@@ -99,6 +99,11 @@ int main()
     kv1.setValue(7.7, snplib_serialization_params_t{}, si, snplib_serialization_params_t{}, 100,
                  snplib_serialization_params_t{});
 
+    std::println("key = '{}'", kv1.key());
+    std::println("value = '{}'", kv1.value());
+    std::println("valueSeq = '{}'\n", kv1.valueSeq());
+
+
     si = std::string{"dekjlwe3"};
     kv1.setValue(snplib_serialization_params_t{}, 7.7, si, 100);
 
@@ -106,6 +111,15 @@ int main()
     std::println("value = '{}'", kv1.value());
     std::println("valueSeq = '{}'\n", kv1.valueSeq());
 
+    si = "WER";
+    kv1.appendValue(snplib_serialization_params_t{}, 77.77, si, 1111);
+
+    std::println("key = '{}'", kv1.key());
+    std::println("value = '{}'", kv1.value());
+    std::println("valueSeq = '{}'\n", kv1.valueSeq());
+
+
+
     snplib_random_string_generator_t<> rstr_gen;
 
     std::println("\n\n");
diff --git a/include/snipplib/utils/snplib_keyvalue_expr.h b/include/snipplib/utils/snplib_keyvalue_expr.h
index 5a11833..9a11335 100644
--- a/include/snipplib/utils/snplib_keyvalue_expr.h
+++ b/include/snipplib/utils/snplib_keyvalue_expr.h
@@ -290,43 +290,12 @@ public:
     }
 
 
-    // value1, ser-pars1, value2, ser-pars2, ..., valueN, ser-parsN
-    template <typename... ValSerParPairTs>
-        requires(mutableContent && sizeof...(ValSerParPairTs) >= 4 && (sizeof...(ValSerParPairTs) % 2 == 0) &&
-                 !snplib_serialization_params_c<std::tuple_element_t<0, std::tuple<ValSerParPairTs...>>>)
-    error_t setValue(ValSerParPairTs&&... pairs)
-    {
-        constexpr auto f = []<size_t... Is>(std::index_sequence<Is...>) {
-            using args_t = std::tuple<ValSerParPairTs...>;
-
-            return ((snplib_serializable_c<std::tuple_element_t<Is * 2, args_t>> &&
-                     snplib_serialization_params_c<std::tuple_element_t<Is * 2 + 1, args_t>>) &&
-                    ...);
-        }(std::make_index_sequence<sizeof...(ValSerParPairTs) / 2>{});
-
-        _valueSeq.clear();  // to trigger the first call to setValue
-
-        return [this](this auto&& self, auto&& v1, auto&& sp1, auto&&... prs) -> error_t {
-            auto err = appendValue(std::forward<decltype(v1)>(v1), std::forward<decltype(sp1)>(sp1));
-            if (err) {
-                return snplib_deduced_error(err, std::make_error_code(std::errc::invalid_argument));
-            }
-
-            if constexpr (sizeof...(prs)) {
-                return std::forward<decltype(self)>(self)(std::forward<decltype(prs)>(prs)...);
-            }
-
-            return {};
-        }(std::forward<ValSerParPairTs>(pairs)...);
-    }
-
-
     // value1, ser-pars1, value2, ser-pars2, ..., valueN, ser-parsN
     //     or
     // common-ser-pars, value1, value2, ..., valueN
     template <typename ArgT, typename... ArgTs>
         requires(mutableContent && sizeof...(ArgTs) > 1)
-    error_t setValue(ArgT&& arg, ArgTs&&... args)
+    error_t appendValue(ArgT&& arg, ArgTs&&... args)
     {
         static constexpr size_t NARGS = sizeof...(ArgTs) + 1;
 
@@ -352,8 +321,6 @@ public:
 
         static_assert(is_val_spar_pairs || is_val_seq, "Unsupported input parameter types!");
 
-        _valueSeq.clear();  // to trigger the first call to setValue
-
         if constexpr (is_val_spar_pairs) {
             return [this](this auto&& self, auto&& v1, auto&& sp1, auto&&... prs) -> error_t {
                 auto err = appendValue(std::forward<decltype(v1)>(v1), std::forward<decltype(sp1)>(sp1));
@@ -387,106 +354,14 @@ public:
         }
     }
 
+    template <typename ArgT, typename... ArgTs>
+        requires(mutableContent && sizeof...(ArgTs) > 1)
+    error_t setValue(ArgT&& arg, ArgTs&&... args)
+    {
+        _valueSeq.clear();  // to trigger the first call to setValue
 
-    // // common-ser-pars, value1, value2, ..., valueN
-    // template <snplib_serialization_params_c SParT, snplib_serializable_c... ValueTs>
-    //     requires(mutableContent && sizeof...(ValueTs) > 1)
-    // error_t setValue(SParT sparams, ValueTs&&... values)
-    // {
-    //     _valueSeq.clear();  // to trigger the first call to setValue
-
-    //     return [sp = std::move(sparams), this]<size_t I = 0>(this auto&& self, auto&& tp) -> error_t {
-    //         using tp_t = std::remove_cvref_t<decltype(tp)>;
-
-    //         if constexpr (I < std::tuple_size_v<tp_t>) {
-    //             auto err = appendValue(
-    //                 std::forward<std::tuple_element_t<I, tp_t>>(std::get<I>(std::forward<decltype(tp)>(tp))),
-    //                 std::move(sp));
-    //             if (err) {
-    //                 return snplib_deduced_error(err, std::make_error_code(std::errc::invalid_argument));
-    //             }
-
-    //             return std::forward<decltype(self)>(self).template operator()<I + 1>(std::forward<decltype(tp)>(tp));
-    //         }
-
-    //         return {};
-    //     }(std::forward_as_tuple(std::forward<ValueTs>(values)...));
-    // }
-
-    // value1, ser-pars1, value2, ser-pars2, ..., valueN, ser-parsN
-    //     or
-    // value1, value2, ..., valueN, common-ser-pars
-    // template <typename... ArgTs>
-    //     requires(mutableContent && sizeof...(ArgTs) > 2)
-    // error_t setValue(ArgTs&&... args)
-    // {
-    //     constexpr auto is_val_spar_pairs = []<size_t... Is>(std::index_sequence<Is...>) {
-    //         using args_t = std::tuple<ArgTs...>;
-
-    //         return ((snplib_serializable_c<std::tuple_element_t<Is * 2, args_t>> &&
-    //                  snplib_serialization_params_c<std::tuple_element_t<Is * 2 + 1, args_t>>) &&
-    //                 ...);
-    //     }(std::make_index_sequence<sizeof...(ArgTs) / 2>{});
-
-    //     using v_args_t = snplib_tuple_except_last_t<ArgTs...>;
-
-    //     constexpr auto is_val_seq = []<size_t... Is>(std::index_sequence<Is...>) {
-    //         return (snplib_serializable_c<std::tuple_element_t<Is, v_args_t>> && ...);
-    //     }(std::make_index_sequence<std::tuple_size_v<v_args_t>>{});
-
-    //     static_assert(is_val_spar_pairs || is_val_seq, "Unsupported input parameter types!");
-
-    //     _valueSeq.clear();  // to trigger the first call to setValue
-
-    //     if constexpr (is_val_spar_pairs) {
-    //         return [this](this auto&& self, auto&& v1, auto&& sp1, auto&&... prs) -> error_t {
-    //             auto err = appendValue(std::forward<decltype(v1)>(v1), std::forward<decltype(sp1)>(sp1));
-    //             if (err) {
-    //                 return snplib_deduced_error(err, std::make_error_code(std::errc::invalid_argument));
-    //             }
-
-    //             if constexpr (sizeof...(prs)) {
-    //                 return std::forward<decltype(self)>(self)(std::forward<decltype(prs)>(prs)...);
-    //             }
-
-    //             return {};
-    //         }(std::forward<ArgTs>(args)...);
-    //     } else {  // value sequence with trailing common serialization parameters
-    //         static_assert(snplib_serialization_params_c<snplib_last_in_pack_t<ArgTs...>>,
-    //                       "The last input parameter must satisfy to 'snplib_serialization_params_c' requirement!");
-
-    //         auto make_vals_tuple = [... args = std::forward<ArgTs>(args)]() mutable {
-    //             return [tp = std::forward_as_tuple(std::forward<ArgTs>(args)...)]<size_t... Is>(
-    //                        std::index_sequence<Is...>) mutable {
-    //                 return std::forward_as_tuple(
-    //                     std::forward<std::tuple_element_t<Is, decltype(tp)>>(std::get<Is>(tp))...);
-    //             }(std::make_index_sequence<sizeof...(ArgTs) - 1>{});
-    //         };
-
-
-    //         return [spar = std::forward<std::tuple_element_t<sizeof...(ArgTs) - 1, decltype(std::forward_as_tuple(
-    //                                                                                    std::forward<ArgTs>(args)...))>>(
-    //                     std::get<sizeof...(ArgTs) - 1>(std::forward_as_tuple(std::forward<ArgTs>(args)...))),
-    //                 this]<size_t I = 0>(this auto&& self, auto&& tp) -> error_t {
-    //             using tp_t = std::remove_cvref_t<decltype(tp)>;
-
-    //             if constexpr (I < std::tuple_size_v<tp_t>) {
-    //                 auto err = appendValue(
-    //                     std::forward<std::tuple_element_t<I, tp_t>>(std::get<I>(std::forward<decltype(tp)>(tp))),
-    //                     std::forward<decltype(spar)>(spar));
-    //                 if (err) {
-    //                     return snplib_deduced_error(err, std::make_error_code(std::errc::invalid_argument));
-    //                 }
-
-    //                 return std::forward<decltype(self)>(self).template operator()<I + 1>(
-    //                     std::forward<decltype(tp)>(tp));
-    //             }
-
-    //             return {};
-    //         }(make_vals_tuple());
-    //     }
-    // }
-
+        return appendValue(std::forward<ArgT>(arg), std::forward<ArgTs>(args)...);
+    }
 
     template <snplib_serializable_c KeyT,
               snplib_serializable_c ValueT,