20	2	(M I)
bird_a	01
bird_b	01
bird_c	01
bird_d	01
bird_e	01
bird_f	01
bird_g	11
bird_h	10
bird_i	01
bird_j	10
bird_k	10
bird_l	10
bird_m	01
bird_n	01
bird_o	01
bird_p	10
bird_q	10
bird_r	10
bird_s	10
bird_t	10
