Returns inferred dict of variable: val = 1 pairs

def _default_seed(self, var_tbl: dict) -> dict:
        """
        Returns inferred dict of variable: val = 1 pairs
        """
        var_names = {}
        #for v in self.var_names:
        #    var_names[v]=1
        for v in var_tbl:
            var_names[v]=1
        return var_names