diff --git a/.gitmodules b/.gitmodules
index 8393b67..60f3c55 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,15 @@
 [submodule "advanced-list-sort"]
 	path = advanced-list-sort
 	url = https://afiqzudinhadi@github.com/afiqzudinhadi/advanced-list-sort.git
+[submodule "count-smiley-faces"]
+	path = count-smiley-faces
+	url = https://github.com/afiqzudinhadi/count-smiley-faces.git
+[submodule "sort-by-letters"]
+	path = sort-by-letters
+	url = https://github.com/afiqzudinhadi/sort-by-letters.git
+[submodule "first-occurrence"]
+	path = first-occurrence
+	url = https://github.com/afiqzudinhadi/first-occurrence.git
+[submodule "check-string-title-capitalize"]
+	path = check-string-title-capitalize
+	url = https://github.com/afiqzudinhadi/check-string-title-capitalize.git
diff --git a/check-string-title-capitalize b/check-string-title-capitalize
new file mode 160000
index 0000000..901355a
--- /dev/null
+++ b/check-string-title-capitalize
@@ -0,0 +1 @@
+Subproject commit 901355a79424f6378c7c91476d98d57b214331db
diff --git a/first-occurrence b/first-occurrence
new file mode 160000
index 0000000..7e98313
--- /dev/null
+++ b/first-occurrence
@@ -0,0 +1 @@
+Subproject commit 7e983139a9a0d27dcb484af16a0a0e4cc12f162d