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Define a new variable, with value of 0, right before your item list.  Inside the list, if the value is 10, then reset it to 1 and add your line break, otherwise increment / add one.
<https://freemarker.apache.org/docs/dgui_misc_var.html>

If you just want to know the length of the item list up front, use the `?size` built-in:  <https://freemarker.apache.org/docs/ref_builtins_sequence.html#ref_builtin_size>

Thanks scott! I'll look into these asap. I'm not good at coding things but ill dive in