diff --git a/src/cmd/ll/main.go b/src/cmd/ll/main.go
new file mode 100644
index 0000000..a28d7ec
--- /dev/null
+++ b/src/cmd/ll/main.go
@@ -0,0 +1,22 @@
+package main
+
+import (
+	"github.com/mojosa-software/godat/src/llx"
+	
+	"fmt"
+)
+
+func main() {
+	ll := llx.New[string]()
+	ll.Append("zero")
+	ll.Append("one")
+	ll.Append("two")
+	ll.Append("three")
+	ll.Append("four")
+	ll.Push("minus one")
+	
+	for p := range ll.Chan() {
+		fmt.Println(p.K, p.V)
+	}
+}
+
diff --git a/src/cmd/pool/main.go b/src/cmd/pool/main.go
new file mode 100644
index 0000000..b174f42
--- /dev/null
+++ b/src/cmd/pool/main.go
@@ -0,0 +1,26 @@
+package main
+
+import (
+	"github.com/mojosa-software/godat/src/poolx"
+	
+	"fmt"
+)
+
+func main() {
+	values := []string{
+		"zero", "one",
+		"should be deleted",
+		"two", "three",
+	}
+	pool := poolx.New[string]()
+	for _, v := range values {
+		pool.Append(v)
+	}
+	
+	pool.DeleteValue("should be deleted")
+	
+	for p := range pool.Chan() {
+		fmt.Println(p.K, p.V)
+	}
+}
+
diff --git a/src/iterx/pair.go b/src/iterx/chan.go
similarity index 100%
rename from src/iterx/pair.go
rename to src/iterx/chan.go
diff --git a/src/iterx/misc.go b/src/iterx/misc.go
new file mode 100644
index 0000000..a797eb1
--- /dev/null
+++ b/src/iterx/misc.go
@@ -0,0 +1,11 @@
+package iterx
+
+func ChanToSlice[V any](c chan V) []V {
+	ret := []V{}
+	for v := range c {
+		ret = append(ret, v)
+	}
+	
+	return ret
+}
+
diff --git a/src/llx/main.go b/src/llx/main.go
index e62a8fd..a0f5777 100644
--- a/src/llx/main.go
+++ b/src/llx/main.go
@@ -5,6 +5,11 @@ package llx
 // linked list than in standard library since it uses
 // the new conception of generics.
 
+import (
+	"github.com/mojosa-software/godat/src/iterx"
+)
+
+// The type represents linked list data structure.
 type LinkedList[V any] struct {
 	// First empty element (not used to store values).
 	// For fast pushing.
@@ -15,17 +20,12 @@ type LinkedList[V any] struct {
 	ln int
 }
 
+// The type represents element of the linked list.
 type Element[V any] struct {
 	next *Element[V]
 	value V
 }
 
-type Pair[V any] struct {
-	I int
-	V V
-}
-
-
 // Returns new empty linked list storing the V type.
 func New[V any]() *LinkedList[V] {
 	return &LinkedList[V]{
@@ -36,7 +36,7 @@ func New[V any]() *LinkedList[V] {
 }
 
 // Get length of the linked list.
-func (ll *LinkedList[V]) Len() int {
+func (ll *LinkedList[V]) Length() int {
 	return ll.ln
 }
 
@@ -75,7 +75,8 @@ func (ll *LinkedList[V]) Set(i int, v V) (bool) {
 	return true
 }
 
-func (ll *LinkedList[V]) Del(i int) (bool) {
+// Deletes the element by its index.
+func (ll *LinkedList[V]) Delete(i int) (bool) {
 	if ll.ln <= i {
 		return false
 	}
@@ -133,32 +134,40 @@ func (ll *LinkedList[V]) Append(v V) {
 	ll.ln++
 }
 
+// Returns the first element of the linked list.
 func (ll *LinkedList[V]) First() *Element[V] {
 	return ll.before.next
 }
 
+// Get elements value.
 func (ll *Element[V]) Value() V {
 	return ll.value
 }
 
+// Returns the next element. If the returned value == nil,
+// then it is the last element.
 func (ll *Element[V]) Next() *Element[V] {
 	return ll.next
 }
 
+// Returns the last element.
 func (ll *LinkedList[V]) Last() *Element[V] {
 	return ll.last
 }
 
 // Returns a channel of Pair that contains index and the value.
-func (ll *LinkedList[V]) Range() chan Pair[V] {
-	chn := make(chan Pair[V])
+func (ll *LinkedList[V]) Chan() iterx.PairChan[int, V] {
+	chn := make(iterx.PairChan[int, V])
 	go func(){
 		i := -1
 		el := ll.before
 		for el.next != nil {
 			i++
 			el = el.next
-			chn <- Pair[V]{i, el.value}
+			chn <- iterx.Pair[int, V]{
+				K: i,
+				V: el.value,
+			}
 		}
 		close(chn)
 	}()
diff --git a/src/poolx/main.go b/src/poolx/main.go
index 220ecf9..102661f 100644
--- a/src/poolx/main.go
+++ b/src/poolx/main.go
@@ -2,6 +2,7 @@ package poolx
 
 import (
 	"github.com/mojosa-software/godat/src/llx"
+	"github.com/mojosa-software/godat/src/iterx"
 )
 
 // Ordered value-only based structure.
@@ -24,12 +25,12 @@ func (p *Pool[V]) Append(v V) {
 }
 
 // Deletes the first appearance of the value in the list.
-func (p *Pool[V]) Del(v V) bool {
+func (p *Pool[V]) DeleteValue(v V) bool {
 	i := 0
 	ll := p.store
 	for e := ll.First() ; e != nil ; e = e.Next() {
 		if e.Value() == v {
-			ll.Del(i)
+			ll.Delete(i)
 			return true
 		}
 		
@@ -39,7 +40,7 @@ func (p *Pool[V]) Del(v V) bool {
 	return false
 }
 
-func (p *Pool[V]) Range() chan llx.Pair[V] {
-	return p.store.Range()
+func (p *Pool[V]) Chan() iterx.PairChan[int, V] {
+	return p.store.Chan()
 }