holding ? loop_delete 1 : loop_load 1 ? loop_load_prepare 1 : loop_save 1 holding ? loop_delete 2 : loop_load 2 ? loop_load_prepare 2 : loop_save 2 Loop 2 Loop 4 Loop 8 Loop 16 holding ? loop_delete 3 : loop_load 3 ? loop_load_prepare 3 : loop_save 3 holding ? loop_delete 4 : loop_load 4 ? loop_load_prepare 4 : loop_save 4