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Match the following with the systems introduced by different Gurus:
1) Guru Ram Das Ji; 2) Guru Angad Dev Ji; 3) Guru Amar Das Ji; 4) Guru Nanak Dev Ji;
A) Langar system; B) Mal Akhara; C) Manji System; D) Masand System; E) Agriculture system; F) Purdah system