diff --git a/07_collections/multidimensional.v b/07_collections/multidimensional.v
index 19ea7cc..9b617ef 100644
--- a/07_collections/multidimensional.v
+++ b/07_collections/multidimensional.v
@@ -70,6 +70,82 @@ pub fn main()
 	}
 
 	users.sort_with_compare(custom_sort_fn)
+
+	nums3 := [0,10,20,30,40]
+	
+	println(nums3[1..4])
+	println(nums3[..4])
+	println(nums3[1..])
+
+	array_1 := [3,5,4,7,6]
+	mut array_2 := [0,1]
+	array_2 << array_1[..3]
+
+	println(array_2)
+
+	// ========================================================== //
+
+	mut a4 := [0,1,2,3,4,5]
+	mut b4 := a4[2..4].clone()
+	b4[0] = 7
+	println(a4)
+	b4 << 9
+	println(a4)
+	println(b4)
+
+	// ========================================================== //
+
+	mut a5 := []int{len: 5, cap: 6, init: 2}
+	mut b5 := unsafe{ a5[1..4] }
+	a5 << 3
+	b5[2] = 13
+	a5 << 4
+	b5[1] = 3
+	println(a5)
+	println(b5)
+
+	// ========================================================== //
+
+	mut a6 := [0,1,2,3,4,5]
+	mut b6 := a6[2..4].clone()
+	b6[0] = 7
+
+	println(a6)
+	println(b6)
+
+	// ========================================================== //
+
+	a8 := [0,1,2,3,4,5,6,7,8,9]
+	println(a8#[-3..])
+	println(a8#[-20..])
+	println(a8#[-20..-8])
+	println(a8#[..-3])
+
+	println(a8#[-20..-10])
+	println(a8#[20..10])
+	println(a8#[20..30])
+
+	// ========================================================== //
+
+	files := ['pipoo.png', '01.bmp', '_v.txt', 'img_02.jpg', 'img_01.JPG']
+	filtered := files.filter(it#[-4..].to_lower() == '.jpg').map(it.to_upper())
+	println(filtered)
+
+	mut fnums := [3]int{}
+
+	fnums[0] = 1
+	fnums[1] = 10
+	fnums[2] = 100
+
+	println(fnums)
+	println(typeof(fnums).name)
+
+	fnums1 := [1,10,100]!
+	anums := fnums[..]
+	
+	println(anums)
+	println(typeof(anums).name)
+
 }	
 
 struct User{