lmm_constraint_t lmm_get_cnst_from_var(lmm_system_t sys, lmm_variable_t var, int num);
int lmm_get_number_of_cnst_from_var(lmm_system_t sys, lmm_variable_t var);
lmm_constraint_t lmm_get_cnst_from_var(lmm_system_t sys, lmm_variable_t var, int num);
int lmm_get_number_of_cnst_from_var(lmm_system_t sys, lmm_variable_t var);