diff --git a/pkg/util/slice.go b/pkg/util/slice.go
new file mode 100644
index 00000000..defd9703
--- /dev/null
+++ b/pkg/util/slice.go
@@ -0,0 +1,81 @@
+// apparmor.d - Full set of apparmor profiles
+// Copyright (C) 2023-2024 Alexandre Pujol <alexandre@pujol.io>
+// SPDX-License-Identifier: GPL-2.0-only
+
+package util
+
+// RemoveDuplicate filter out all duplicates from a slice. Also filter out empty element.
+func RemoveDuplicate[T comparable](inlist []T) []T {
+	var empty T
+	list := []T{}
+	seen := map[T]bool{}
+	seen[empty] = true
+	for _, item := range inlist {
+		if _, ok := seen[item]; !ok {
+			seen[item] = true
+			list = append(list, item)
+		}
+	}
+	return list
+}
+
+// Intersect returns the intersection between two collections.
+// From https://github.com/samber/lo
+func Intersect[T comparable](list1 []T, list2 []T) []T {
+	result := []T{}
+	seen := map[T]struct{}{}
+
+	for _, elem := range list1 {
+		seen[elem] = struct{}{}
+	}
+
+	for _, elem := range list2 {
+		if _, ok := seen[elem]; ok {
+			result = append(result, elem)
+		}
+	}
+
+	return result
+}
+
+// Flatten returns an array a single level deep.
+// From https://github.com/samber/lo
+func Flatten[T comparable](collection [][]T) []T {
+	totalLen := 0
+	for i := range collection {
+		totalLen += len(collection[i])
+	}
+
+	result := make([]T, 0, totalLen)
+	for i := range collection {
+		result = append(result, collection[i]...)
+	}
+
+	return result
+}
+
+// Invert creates a map composed of the inverted keys and values. If map
+// contains duplicate values, subsequent values overwrite property assignments
+// of previous values.
+// Play: https://go.dev/play/p/rFQ4rak6iA1
+func Invert[K comparable, V comparable](in map[K]V) map[V]K {
+	out := make(map[V]K, len(in))
+
+	for k := range in {
+		out[in[k]] = k
+	}
+
+	return out
+}
+
+func InvertFlatten[V comparable](in map[V][]V) map[V]V {
+	out := make(map[V]V, len(in))
+
+	for k := range in {
+		for _, v := range in[k] {
+			out[v] = k
+		}
+	}
+
+	return out
+}
diff --git a/pkg/util/slice_test.go b/pkg/util/slice_test.go
new file mode 100644
index 00000000..11f05a71
--- /dev/null
+++ b/pkg/util/slice_test.go
@@ -0,0 +1,120 @@
+// apparmor.d - Full set of apparmor profiles
+// Copyright (C) 2023-2024 Alexandre Pujol <alexandre@pujol.io>
+// SPDX-License-Identifier: GPL-2.0-only
+
+package util
+
+import (
+	"reflect"
+	"testing"
+)
+
+func TestRemoveDuplicate(t *testing.T) {
+	tests := []struct {
+		name   string
+		inlist []string
+		want   []string
+	}{
+		{
+			name:   "Duplicate",
+			inlist: []string{"foo", "bar", "foo", "bar", ""},
+			want:   []string{"foo", "bar"},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := RemoveDuplicate(tt.inlist); !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("RemoveDuplicate() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func TestIntersect(t *testing.T) {
+	tests := []struct {
+		name  string
+		list1 []int
+		list2 []int
+		want  []int
+	}{
+		{
+			name:  "1",
+			list1: []int{0, 1, 2, 3, 4, 5},
+			list2: []int{0, 2},
+			want:  []int{0, 2},
+		},
+		{
+			name:  "2",
+			list1: []int{0, 1, 2, 3, 4, 5},
+			list2: []int{0, 6},
+			want:  []int{0},
+		},
+		{
+			name:  "3",
+			list1: []int{0, 1, 2, 3, 4, 5},
+			list2: []int{-1, 6},
+			want:  []int{},
+		},
+		{
+			name:  "4",
+			list1: []int{0, 6},
+			list2: []int{0, 1, 2, 3, 4, 5},
+			want:  []int{0},
+		},
+		{
+			name:  "5",
+			list1: []int{0, 6, 0},
+			list2: []int{0, 1, 2, 3, 4, 5},
+			want:  []int{0},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := Intersect(tt.list1, tt.list2); !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("Intersect() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func TestFlatten(t *testing.T) {
+	tests := []struct {
+		name  string
+		input [][]int
+		want  []int
+	}{
+		{
+			name:  "1",
+			input: [][]int{{0, 1}, {2, 3, 4, 5}},
+			want:  []int{0, 1, 2, 3, 4, 5},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := Flatten(tt.input); !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("Intersect() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func TestInvert(t *testing.T) {
+	tests := []struct {
+		name  string
+		input map[string]int
+		want  map[int]string
+	}{
+		{
+			name:  "1",
+			input: map[string]int{"a": 1, "b": 2},
+			want:  map[int]string{1: "a", 2: "b"},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := Invert(tt.input); !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("Invert() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
diff --git a/pkg/util/tools.go b/pkg/util/tools.go
index 30d5251d..0d3372fc 100644
--- a/pkg/util/tools.go
+++ b/pkg/util/tools.go
@@ -67,40 +67,6 @@ func DecodeHexInString(str string) string {
 	return str
 }
 
-// RemoveDuplicate filter out all duplicates from a slice. Also filter out empty element.
-func RemoveDuplicate[T comparable](inlist []T) []T {
-	var empty T
-	list := []T{}
-	seen := map[T]bool{}
-	seen[empty] = true
-	for _, item := range inlist {
-		if _, ok := seen[item]; !ok {
-			seen[item] = true
-			list = append(list, item)
-		}
-	}
-	return list
-}
-
-// Intersect returns the intersection between two collections.
-// From https://github.com/samber/lo
-func Intersect[T comparable](list1 []T, list2 []T) []T {
-	result := []T{}
-	seen := map[T]struct{}{}
-
-	for _, elem := range list1 {
-		seen[elem] = struct{}{}
-	}
-
-	for _, elem := range list2 {
-		if _, ok := seen[elem]; ok {
-			result = append(result, elem)
-		}
-	}
-
-	return result
-}
-
 // CopyTo recursivelly copy all files from a source path to a destination path.
 func CopyTo(src *paths.Path, dst *paths.Path) error {
 	files, err := src.ReadDirRecursiveFiltered(nil,
diff --git a/pkg/util/tools_test.go b/pkg/util/tools_test.go
index 4d5cade6..df45d92b 100644
--- a/pkg/util/tools_test.go
+++ b/pkg/util/tools_test.go
@@ -38,74 +38,6 @@ func TestDecodeHexInString(t *testing.T) {
 	}
 }
 
-func TestRemoveDuplicate(t *testing.T) {
-	tests := []struct {
-		name   string
-		inlist []string
-		want   []string
-	}{
-		{
-			name:   "Duplicate",
-			inlist: []string{"foo", "bar", "foo", "bar", ""},
-			want:   []string{"foo", "bar"},
-		},
-	}
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			if got := RemoveDuplicate(tt.inlist); !reflect.DeepEqual(got, tt.want) {
-				t.Errorf("RemoveDuplicate() = %v, want %v", got, tt.want)
-			}
-		})
-	}
-}
-
-func TestIntersect(t *testing.T) {
-	tests := []struct {
-		name  string
-		list1 []int
-		list2 []int
-		want  []int
-	}{
-		{
-			name:  "1",
-			list1: []int{0, 1, 2, 3, 4, 5},
-			list2: []int{0, 2},
-			want:  []int{0, 2},
-		},
-		{
-			name:  "2",
-			list1: []int{0, 1, 2, 3, 4, 5},
-			list2: []int{0, 6},
-			want:  []int{0},
-		},
-		{
-			name:  "3",
-			list1: []int{0, 1, 2, 3, 4, 5},
-			list2: []int{-1, 6},
-			want:  []int{},
-		},
-		{
-			name:  "4",
-			list1: []int{0, 6},
-			list2: []int{0, 1, 2, 3, 4, 5},
-			want:  []int{0},
-		},
-		{
-			name:  "5",
-			list1: []int{0, 6, 0},
-			list2: []int{0, 1, 2, 3, 4, 5},
-			want:  []int{0},
-		},
-	}
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			if got := Intersect(tt.list1, tt.list2); !reflect.DeepEqual(got, tt.want) {
-				t.Errorf("Intersect() = %v, want %v", got, tt.want)
-			}
-		})
-	}
-}
-
 func TestToRegexRepl(t *testing.T) {
 	tests := []struct {
 		name string