<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _replace_variable_chunks(self, cmds):
 """ List through a list of command chunks. Return a single list with any variable bits blanked out. """


        cons_cmd = None
        while cons_cmd is None:
            for cmd in cmds:
                if cons_cmd is None:
                    cons_cmd = cmd[:]
                else:
                    for idx, s in enumerate(cons_cmd):
                        if s not in cmd:
                            cons_cmd[idx] = self.var_html
        return cons_cmd