formatter.declarePrefixMapping(seq1.getPrefixMapping());
formatter.declarePrefixMapping(seq2.getPrefixMapping());
if (config != null) formatter.setConfig(config);
SequenceSlicer slicer = new SequenceSlicer(seq1, seq2);
slicer.slice();
slicer.formatStart(formatter);
DiffXAlgorithm df = new DiffXFitopsy(seq1, seq2);
df.process(formatter);
slicer.formatEnd(formatter);
}