premise: A man and woman, each wearing a white shirt, are walking down the sidewalk while talking on their phones. hypothesis: A man and woman, each wearing a white shirt, are walking down the sidewalk while unbeknownst to them, the person they're conversing with on their phone is each other.
neutral: Just because two people are talking on their phones doesn't mean they're conversing with each other; even if they are, it doesn't mean that this circumstance is unbeknownst to them.