Instance ordering and free-variable fill follow WL-internal BDD structure (not reproducible black-box)
.wl రిఫరెన్స్ నుండి భిన్నం: `SatisfiabilityInstances` ordering
SatisfiabilityInstances[bf]
SatisfiabilityInstances[expr, {a1, a2, …}]
SatisfiabilityInstances[…, …, m]