static void lmm_var_free(lmm_system_t sys, lmm_variable_t var);
static void lmm_cnst_free(lmm_system_t sys, lmm_constraint_t cnst);
static void lmm_var_free(lmm_system_t sys, lmm_variable_t var);
static void lmm_cnst_free(lmm_system_t sys, lmm_constraint_t cnst);