diff --git a/syntax/std_seq_helper.go b/syntax/std_seq_helper.go
new file mode 100644
index 00000000..dd98b21e
--- /dev/null
+++ b/syntax/std_seq_helper.go
@@ -0,0 +1,28 @@
+package syntax
+
+import (
+	"github.com/arr-ai/arrai/rel"
+)
+
+// ContainsArray check if array a contains array b.
+func ContainsArray(a rel.Array, b rel.Array) rel.Value {
+	// Get index of b[0] in a
+	bOffset := 0
+	bVals := b.Values()
+	arrayEnum, _ := a.ArrayEnumerator()
+	for arrayEnum.MoveNext() {
+		if bOffset < len(bVals) && arrayEnum.Current().Equal(bVals[bOffset]) {
+			bOffset++
+		} else {
+			if bOffset > 0 && bOffset < len(bVals) {
+				return rel.NewBool(false)
+			}
+		}
+	}
+
+	if bOffset == len(bVals) {
+		return rel.NewBool(true)
+	}
+
+	return rel.NewBool(false)
+}
diff --git a/syntax/std_seq_test.go b/syntax/std_seq_test.go
index ce4ea482..0d0a26e9 100644
--- a/syntax/std_seq_test.go
+++ b/syntax/std_seq_test.go
@@ -40,20 +40,26 @@ func TestSeqRepeat(t *testing.T) {
 func TestContains(t *testing.T) {
 	t.Parallel()
 	// string
-	// AssertCodesEvalToSameValue(t, `true `, `//seq.contains("this is a test", "")             `)
-	// AssertCodesEvalToSameValue(t, `true `, `//seq.contains("this is a test", "is a test")    `)
-	// AssertCodesEvalToSameValue(t, `false`, `//seq.contains("this is a test", "is not a test")`)
-	// assertExprPanics(t, `//seq.contains(123, 124)`)
+	AssertCodesEvalToSameValue(t, `true `, `//seq.contains("this is a test", "")             `)
+	AssertCodesEvalToSameValue(t, `true `, `//seq.contains("this is a test", "is a test")    `)
+	AssertCodesEvalToSameValue(t, `false`, `//seq.contains("this is a test", "is not a test")`)
+	assertExprPanics(t, `//seq.contains(123, 124)`)
 	// array
-	// AssertCodesEvalToSameValue(t, `true`, `//seq.contains([1,2,3,4,5],1)`)
-	// AssertCodesEvalToSameValue(t, `true`, `//seq.contains([1,2,3,4,5],3)`)
-	// AssertCodesEvalToSameValue(t, `true`, `//seq.contains([1,2,3,4,5],5)`)
+	AssertCodesEvalToSameValue(t, `true`, `//seq.contains([1,2,3,4,5],1)`)
+	AssertCodesEvalToSameValue(t, `true`, `//seq.contains([1,2,3,4,5],3)`)
+	AssertCodesEvalToSameValue(t, `true`, `//seq.contains([1,2,3,4,5],5)`)
 
-	// AssertCodesEvalToSameValue(t, `true`, `//seq.contains(['A','B','C','D','E'],'A')`)
-	// AssertCodesEvalToSameValue(t, `true`, `//seq.contains(['A','B','C','D','E'],'E')`)
-	// AssertCodesEvalToSameValue(t, `true`, `//seq.contains(['A','B','C','D','E'],'C')`)
+	AssertCodesEvalToSameValue(t, `true`, `//seq.contains(['A','B','C','D','E'],'A')`)
+	AssertCodesEvalToSameValue(t, `true`, `//seq.contains(['A','B','C','D','E'],'E')`)
+	AssertCodesEvalToSameValue(t, `true`, `//seq.contains(['A','B','C','D','E'],'C')`)
 
+	AssertCodesEvalToSameValue(t, `true`, `//seq.contains(['A','B','C','D','E'],['A','B','C'])`)
 	AssertCodesEvalToSameValue(t, `true`, `//seq.contains(['A','B','C','D','E'],['B','C'])`)
+	AssertCodesEvalToSameValue(t, `true`, `//seq.contains(['A','B','C','D','E'],['C','D','E'])`)
+	AssertCodesEvalToSameValue(t, `true`, `//seq.contains(['A','B','C','D','E'],['A','B','C','D','E'])`)
+	AssertCodesEvalToSameValue(t, `false`, `//seq.contains(['A','B','C','D','E'],['B','C','E'])`)
+	AssertCodesEvalToSameValue(t, `false`, `//seq.contains(['A','B','C','D','E'],['A','B','C','E'])`)
+	AssertCodesEvalToSameValue(t, `false`, `//seq.contains(['A','B','C','D','E'],['A','B','C','D','E','F'])`)
 }
 
 ///////////////////