code: def get_linkage(self, line):
          
          conf1, id1, chain1, pos1 = line[16].strip(), line[17:20].strip(), line[21].strip(), int(line[22:26])
          conf2, id2, chain2, pos2 = line[46].strip(), line[47:50].strip(), line[51].strip(), int(line[52:56])
          return self.covlinkage(id1=id1, chain1=chain1, pos1=pos1, conf1=conf1,
                                 id2=id2, chain2=chain2, pos2=pos2, conf2=conf2)
docs: Get the linkage information from a LINK entry PDB line.