update contains on interleaving

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (10a714c) 91.20% compared to head (86ffeea) 91.22%. Report is 2 commits behind head on dev.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #165 +/- ## ========================================== + Coverage 91.20% 91.22% +0.02% ========================================== Files 14 14 Lines 1250 1253 +3 ========================================== + Hits 1140 1143 +3 Misses 110 110 ```

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