Don't use eaxct macth filter for cross hybridization because we would need to compare to the reverse complement sequence, which cannot be done with the current implementation that makes the filter very fast. Instead one can simply use the Bowtie Filter.
Only provide one apply function for the exact match filter, which takes a filter policy as input by which the duplicated oligos are removed, i.e. don't just remove all of them but have options on how to remove (e.g. by larger number of oligos)
Fix issue with exact match filter: