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# Filtering data

`cogent3` apps provide simple and sophisticated means to filter genomic data.

- Removing degenerate characters
- Removing highly gapped positions
- Remove problem sequences from an alignment
- Remove duplicated sequences from an alignment
- Filter sequence collections and alignments by length
- Sample an alignment to a fixed length
- Remove trailing stop codons from sequences in an alignment
- Sample nucleotides from a given codon position
- Select named sequences from a collection
- Select n sequences from a collection
- Concatenating alignments