L1 = lmm_constraint_new(Sys, (void *) "L1", a);
L2 = lmm_constraint_new(Sys, (void *) "L2", b);
L3 = lmm_constraint_new(Sys, (void *) "L3", a);
L1 = lmm_constraint_new(Sys, (void *) "L1", a);
L2 = lmm_constraint_new(Sys, (void *) "L2", b);
L3 = lmm_constraint_new(Sys, (void *) "L3", a);