If and to the extent necessary for the continuation of the proceedings
HOR.2017.38, we, on behalf of A. [in Kurzform], also retrospectively
approve the filing of the challenge / nullity claim of 4 Mai 2017 and all
other submissions in these proceedings HOR.2017.38."

Das durch T., U. und V. unterzeichnete Schreiben vom 29. November
2017 (RB 87) lautet folgendermassen:

" Power of Attorney granted by A. [in Kurzform] to O. [Anwaltskanzlei AG]

Dear Mr. Vice-President, dear Members of the Commercial Court of
the Canton of Aargau