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scchart ABRO {
  input bool A, B, R
  output bool O

  initial state ABO {
    entry do O = false

    initial state WaitAB {
      region:

      initial state wA
      if A go to dA if A

      final state dA

      region:

      initial state wB
      if B go to dB if B

      final state dB
    }
    join to done do O = true join to done

    state done
  }
  if R abort to ABO if R
}