RUSH MEMO for Public Elementary & Secondary Schools & All Others Concerned: Addendum to the Unnumbered Division Memorandum dated May 21, 2015 entitled Participation of SDO-Mandaluyong to the K to 12 Anniversary Celebration Posted on May 27, 2015 by MSM13 Leave a comment 1823. Addendum to the Unnumbered Division Memorandum dated May 21, 2015 entitled Participation of SDO-Mandaluyong to the K to 12 Anniversary Celebration Memorandum