<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def set(cls, values):
 """ Set the elements from the data obtained from REST API. Args: values (dict):
 Dict with ``mrc``, ``oai``, ``dc`` and ``fn`` keys. """

        cls.mrc_out_el.text = values.get("mrc", "")
        cls.oai_out_el.text = values.get("oai", "")
        cls.dc_out_el.text = values.get("dc", "")
        cls.filename = values.get("fn", "fn")

        cls.values = values