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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def load_saved_bts(self):
 """If the AnnotatedInteractions object was saved to a pickle and reloaded, this method remakes the BedTool objects."""

        if self._bt1_path:
            self.bt1 = pbt.BedTool(self._bt1_path)
        if self._bt2_path:
            self.bt2 = pbt.BedTool(self._bt2_path)
        if self._bt_loop_path:
            self.bt_loop = pbt.BedTool(self._bt_loop_path)
        if self._bt_loop_inner_path:
            self.bt_loop_inner = pbt.BedTool(self._bt_loop_inner_path)