digraph b {
ABC42;
ABC43;
ABC44;
ABC45;
ABC46;
ABC47;
ABC48;
ABC49;
ABC50;
ABC51;
ABC52;
ABC53;
ABC54;
DEFGHIJKLMN1;
DEFGHIJKLMN2;
DEFGHIJKLMN3; 
DEFGHIJKLMN4; 
DEFGHIJKLMN5; 
ABC42 -> ABC43;
ABC43 -> ABC44;
ABC44 -> ABC45;
ABC45 -> ABC46;
ABC46 -> ABC47;
ABC47 -> ABC48;
ABC48 -> ABC49;
ABC49 -> ABC50;
ABC50 -> ABC51;
ABC51 -> ABC52;
ABC52 -> ABC53;
ABC53 -> ABC54;
DEFGHIJKLMN1 -> DEFGHIJKLMN2;
DEFGHIJKLMN2 -> DEFGHIJKLMN3;
DEFGHIJKLMN3 -> DEFGHIJKLMN4;
DEFGHIJKLMN4 -> DEFGHIJKLMN5
ABC44 -> DEFGHIJKLMN1;
ABC49 -> DEFGHIJKLMN3;
ABC53 -> DEFGHIJKLMN5;



}