Watashi-wa [[ Hanako-ka Jiro-ka]-ga hashitta-ka] shir-anai .
I-TOP  Hanako-KA Jiro-KA-NOM ran-KA know-NEG
I don’t know whether or not either Hanako or Jiro ran.’ (✓ YNQ) ‘I don’t know which is true: Hanako ran or Jiro ran.’ (*AltQ)