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print ([[

File format for mapping_file:

The supplied mapping file defines a mapping table named ``chseqids''. It maps
the sequence-regions given in the GFF3_file to other names.  It can be defined
as follows:

chseqids = {
  chr1  = "seq1",
  chr2  = "seq2"
}

When this example is used, all sequence ids ``chr1'' will be changed to ``seq1''
and all sequence ids ``chr2'' to ``seq2''.]])