How to add condition in ng-repeat (puzzle)?

Question

Angular

There is an array of users - displayed by ng-repeat with a filter. Each user has an array of items - displayed inside the user by ng-repeat with a filter. There is an array with someStuff data.
Items are displayed 4 in a row.
It is necessary to display another row after every fourth row of items - the n-th element from someStuff
Here is the bar plnkr.co/edit/856TVTd0l1UnTImrZ7wp?p=preview
The final result from this bar would look like this (the inserted row is marked with a red line) https://gyazo .com/e021313a07ace76683ae503527f1dc09

Answer 1

everything is simple. Instead of solving this puzzle, just prepare the data as you need it for the presentation.
And yes, don't use collection filters.

Answer 2

something ng-if="$index % 4 == 0" and then some more ng-repeat?
try it should work.