CONSTANTS
  Nodes = {n1, n2, n3}
  Nil = Nil
  MaxTerm = 3
  MaxLogLen = 3

SPECIFICATION Spec

CHECK_DEADLOCK FALSE

INVARIANTS
  TypeOk
  ElectionSafety
  LeaderAppendOnly
  StateMachineSafety
  CommittedIndexValid
  LogMatching
  LeaderHasSelfHeartbeat