diff --git a/.gitmodules b/.gitmodules
index 26d9052..3a41b2c 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -26,3 +26,9 @@
 [submodule "roles.extern/selfsignedcert"]
 	path = roles.extern/selfsignedcert
 	url = https://git.velt.biz/Ansible/selfsignedcert.git
+[submodule "roles.extern/roles_timesync"]
+	path = roles.extern/roles_timesync
+	url = https://git.velt.biz/Ansible/roles_timesync.git
+[submodule "12/Prepare_Workshop"]
+	path = 12/Prepare_Workshop
+	url = https://git.velt.biz/Ansible/Prepare_Workshop.git
diff --git a/12/group_by.yml b/12/group_by.yml
new file mode 100644
index 0000000..d044165
--- /dev/null
+++ b/12/group_by.yml
@@ -0,0 +1,38 @@
+---
+- hosts:
+    - all
+    - localhost
+
+  tasks:
+    - group_by:
+        key: "sv_pkgsvcmgr_{{ ansible_pkg_mgr }}-{{ ansible_service_mgr }}"
+        parents:
+          - "sv_pkgmgr_{{ ansible_pkg_mgr }}"
+
+    - group_by:
+        key: "sv_svcmgr_{{ ansible_service_mgr }}"
+
+    - group_by:
+        key: "sv_mac_{{ '_'.join(ansible_default_ipv4.macaddress.split(':')[5:6]) }}"
+
+    - group_by:
+        key: "sv_net4_{{ ansible_default_ipv4.network }}"
+
+    - group_by:
+        key: "sv_v6int_{{ ansible_default_ipv6.interface|default('nov6') }}"
+
+    - group_by:
+        key: "sv_distri_{{ ansible_distribution }}"
+
+    - group_by:
+        key: "sv_family_{{ ansible_os_family }}"
+
+    - group_by:
+        key: "sv_{{ ansible_virtualization_role }}_{{ ansible_virtualization_type }}"
+
+- hosts: localhost
+  gather_facts: no
+  tasks:
+    - debug:
+        msg: "{{ groups | dict2items | selectattr('key', 'contains', 'sv_') | list | items2dict }}"
+
diff --git a/12/timesync.yml b/12/timesync.yml
new file mode 120000
index 0000000..6c62d55
--- /dev/null
+++ b/12/timesync.yml
@@ -0,0 +1 @@
+../roles.extern/roles_timesync/timesync.yml
\ No newline at end of file
diff --git a/roles.extern/roles_timesync b/roles.extern/roles_timesync
new file mode 160000
index 0000000..bb38d9e
--- /dev/null
+++ b/roles.extern/roles_timesync
@@ -0,0 +1 @@
+Subproject commit bb38d9e89130b68dabf997059cf8f863d4625739