diff --git a/include/extra/dict.h b/include/extra/dict.h
index 972b77b..1f8edc5 100644
--- a/include/extra/dict.h
+++ b/include/extra/dict.h
@@ -14,3 +14,16 @@ extern int  libcdsb_dict_foreach      (vtype_dict* x, void* data, dict_access_ca
 extern bool libcdsb_dict_shrink_to_fit(vtype_dict* x)                                                                              Nonnull__(1);
 
 #endif /* LIBCDSB_EXTRA_DICT_H */
+
+#if defined(LIBCDSB_LIST_H) && !defined(LIBCDSB_EXTRA_DICT_H_EXT)
+#define LIBCDSB_EXTRA_DICT_H_EXT
+
+#define dict_copy_keys      libcdsb_dict_copy_keys
+#define dict_duplicate_keys libcdsb_dict_duplicate_keys
+#define dict_init_keys      libcdsb_dict_init_keys
+
+extern vtype_list  libcdsb_dict_copy_keys     (const vtype_dict* s)                Nonnull__(1);
+extern vtype_list* libcdsb_dict_duplicate_keys(const vtype_dict* s)                Nonnull__(1);
+extern void        libcdsb_dict_init_keys     (vtype_list* x, const vtype_dict* s) Nonnull__(1,2);
+
+#endif /* LIBCDSB_EXTRA_DICT_H_EXT */
diff --git a/src/dict/extra.c b/src/dict/extra.c
index 81d645c..5732977 100644
--- a/src/dict/extra.c
+++ b/src/dict/extra.c
@@ -1,6 +1,7 @@
 /* This software is licensed by the MIT License, see LICENSE file */
 /*                                Copyright © 2022 Gregory Lirent */
 
+#include "../../include/extra/list.h"
 #include "include.h"
 
 /*#####################################################################################################################*/
@@ -167,3 +168,69 @@ int libcdsb_dict_foreach(dict_t* x, void* dt, dict_access_callback callback, boo
   end_:
     return r;
 }
+
+/*#####################################################################################################################*/
+
+vtype_list libcdsb_dict_copy_keys(const vtype_dict* s) {
+    vtype_list x;
+    dnode_t   *c;
+    size_t     i;
+
+    i = s->capacity;
+
+    list_init(&x);
+
+    while (i--) {
+        c = s->nodes[i];
+
+        while (!is_null(c)) {
+            libcdsb_list_update(&x, -1, vnode_peek(&c->key, c->key_type), c->key_type, 1);
+            c = c->prev;
+        }
+    }
+
+    return x;
+}
+
+
+vtype_list* libcdsb_dict_duplicate_keys(const vtype_dict* s) {
+    vtype_list* x;
+    dnode_t    *c;
+    size_t      i;
+
+    x = malloc(sizeof(*x));
+    i = s->capacity;
+
+    list_init(x);
+
+    while (i--) {
+        c = s->nodes[i];
+
+        while (!is_null(c)) {
+            libcdsb_list_update(x, -1, vnode_peek(&c->key, c->key_type), c->key_type, 1);
+            c = c->prev;
+        }
+    }
+
+    return x;
+}
+
+
+void libcdsb_dict_init_keys(vtype_list* x, const vtype_dict* s) {
+    dnode_t    *c;
+    size_t      i;
+
+    x = malloc(sizeof(*x));
+    i = s->capacity;
+
+    list_init(x);
+
+    while (i--) {
+        c = s->nodes[i];
+
+        while (!is_null(c)) {
+            libcdsb_list_update(x, -1, vnode_peek(&c->key, c->key_type), c->key_type, 1);
+            c = c->prev;
+        }
+    }
+}