helpString += "The pre.cluster command should be in the following format: \n";
helpString += "pre.cluster(fasta=yourFastaFile, names=yourNamesFile, diffs=yourMaxDiffs) \n";
helpString += "Example pre.cluster(fasta=amazon.fasta, diffs=2).\n";
helpString += "The pre.cluster command should be in the following format: \n";
helpString += "pre.cluster(fasta=yourFastaFile, names=yourNamesFile, diffs=yourMaxDiffs) \n";
helpString += "Example pre.cluster(fasta=amazon.fasta, diffs=2).\n";