int sn_stage_swap (sn_stage_t *s, int con0, int con1);
int sn_stage_cut_at (sn_stage_t *s, int input, enum sn_network_cut_dir_e dir);
int sn_stage_remove_input (sn_stage_t *s, int input);
int sn_stage_swap (sn_stage_t *s, int con0, int con1);
int sn_stage_cut_at (sn_stage_t *s, int input, enum sn_network_cut_dir_e dir);
int sn_stage_remove_input (sn_stage_t *s, int input);