Implement slice filter according the jinja2 documentation:
Slice an iterator and return a list of lists containing those items.
If you pass it a second argument it’s used to fill missing values on the last iteration.
For instance, slice(3, 0) applied to the list [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16] should give the list of lists of three items each:
[[1, 2, 3],
[4, 5, 6],
[7, 8, 9],
[10, 11, 12],
[13, 14, 15],
[16, 0, 0]]
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