CONSTANTS
  Keys = {k1, k2}
  Values = {v1, v2}
  Nil = Nil
  MaxTxnId = 2

INIT Init
NEXT Next

CHECK_DEADLOCK FALSE

INVARIANTS
  TypeOk
  NoDirtyReads
  ReadOwnWrites
  WriteWriteConflict
  CommittedMustStart
  CommittedVersionsUnique
  NoWriteSkew