Thank you for your prompt response!
In the letter:
[example]1[/example] – works
[group-example]2[group-example] – doesn’t work
[group example]3[/group example] – doesn’t work
[example-group]4[example-group] – doesn’t work
[example group]5[example group] – doesn’t work
yes, correct. If your group is named “example” only [example]...[/example] will work.