code: def preprocessing_declaration(job, config):
      
      if config.preprocessing:
          job.fileStore.logToMaster('Ran preprocessing: ' + config.uuid)
          disk = '1G' if config.ci_test else '20G'
          mem = '2G' if config.ci_test else '10G'
          processed_normal = job.wrapJobFn(run_gatk_preprocessing, config.normal_bam, config.normal_bai,
                                           config.reference, config.dict, config.fai, config.phase, config.mills,
                                           config.dbsnp, mem, cores=1, memory=mem, disk=disk)
          processed_tumor = job.wrapJobFn(run_gatk_preprocessing, config.tumor_bam, config.tumor_bai,
                                          config.reference, config.dict, config.fai, config.phase, config.mills,
                                          config.dbsnp, mem, cores=1, memory=mem, disk=disk)
          static_workflow = job.wrapJobFn(static_workflow_declaration, config, processed_normal.rv(0),
                                          processed_normal.rv(1), processed_tumor.rv(0), processed_tumor.rv(1))
          job.addChild(processed_normal)
          job.addChild(processed_tumor)
          job.addFollowOn(static_workflow)
      else:
          job.addFollowOnJobFn(static_workflow_declaration, config, config.normal_bam, config.normal_bai,
                               config.tumor_bam, config.tumor_bai)
docs: Declare jobs related to preprocessing
  
      :param JobFunctionWrappingJob job: passed automatically by Toil
      :param Namespace config: Argparse Namespace object containing argument inputs