<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _prt_ver_n_key(self, prt, verbose):
 """Print GO DAG version and key indicating presence of GO ID in a list."""

        pre = '# '
        prt.write('# ----------------------------------------------------------------\n')
        prt.write('# - Description of GO ID fields\n')
        prt.write('# ----------------------------------------------------------------\n')
        prt.write("# Versions:\n#    {VER}\n".format(VER="\n#    ".join(self.objgrpd.ver_list)))
        prt.write('\n# Marker keys:\n')
        for ntgos in self.go_ntsets:
            prt.write('#     X -> GO is present in {HDR}\n'.format(HDR=ntgos.hdr))
        if verbose:
            prt.write('\n# Markers for header GO IDs and user GO IDs:\n')
            prt.write("#     '**' -> GO term is both a header and a user GO ID\n")
            prt.write("#     '* ' -> GO term is a header, but not a user GO ID\n")
            prt.write("#     '  ' -> GO term is a user GO ID\n")
        prt.write('\n# GO Namspaces:\n')
        prt.write('#     BP -> Biological Process\n')
        prt.write('#     MF -> Molecular Function\n')
        prt.write('#     CC -> Cellualr Component\n')
        if verbose:
            prt.write('\n# Example fields: 5 uGOs   362  47 L04 D04 R04\n')
            prt.write('#     N uGOs         -> number of user GO IDs under this GO header\n')
            prt.write('#     First integer  -> number of GO descendants\n')
            prt.write('#     Second integer -> number of GO children for the current GO ID\n')
        prt.write('\n# Depth information:\n')
        if not verbose:
            prt.write('#     int -> number of GO descendants\n')
        if verbose:
            prt.write('#     Lnn -> level (minimum distance from root to node)\n')
        prt.write('#     Dnn -> depth (maximum distance from root to node)\n')
        if verbose:
            prt.write('#     Rnn -> depth accounting for relationships\n\n')
            RelationshipStr().prt_keys(prt, pre)
        if verbose:
            prt.write('\n')
            objd1 = GoDepth1LettersWr(self.gosubdag.rcntobj)
            objd1.prt_header(prt, 'DEPTH-01 GO terms and their aliases', pre)
            objd1.prt_txt(prt, pre)