diff --git a/modules/13_cpp23/src/ranges_zip.cpp b/modules/13_cpp23/src/ranges_zip.cpp
index 45b59e3..edc71bf 100644
--- a/modules/13_cpp23/src/ranges_zip.cpp
+++ b/modules/13_cpp23/src/ranges_zip.cpp
@@ -3,19 +3,23 @@
 namespace cpp23 {
 
 auto zip_sum(const std::vector<int>& a, const std::vector<int>& b) -> std::vector<int> {
-    (void)a; (void)b;
-    return {};
+    return std::views::zip_transform(std::plus{}, a, b)
+        | std::ranges::to<std::vector>();
 }
 
-auto chunk_strings(const std::vector<std::string>& words, std::size_t chunk_size)
-    -> std::vector<std::vector<std::string>> {
-    (void)words; (void)chunk_size;
-    return {};
+auto chunk_strings(const std::vector<std::string>& words, const std::size_t chunk_size) -> std::vector<std::vector<std::string>> {
+    return words
+        | std::views::chunk(chunk_size)
+        | std::views::transform([](const auto& chunk) {
+            return chunk | std::ranges::to<std::vector<std::string>>();
+        })
+        | std::ranges::to<std::vector<std::vector<std::string>>>();
 }
 
 auto adjacent_differences(const std::vector<int>& data) -> std::vector<int> {
-    (void)data;
-    return {};
+    return data
+        | std::views::adjacent_transform<2>([](const int x, const int y) { return y - x; })
+        | std::ranges::to<std::vector<int>>();
 }
 
 }  // namespace cpp23