A voice may pertain-to a duck.Logical formLearned from13 sentences. A duck may quack.Logical formLearned from13 sentences. A male can be a bit of a duck.Logical formLearned from13 sentences. A head may pertain-to a duck.Logical formLearned from13 sentences. A (duck skin) can be crispy.Logical formLearned from13 sentences. A duck can be weird.Logical formLearned from13 sentences. A duck can be friendly.Logical formLearned from13 sentences. A duck may walk into a bar.Logical formLearned from13 sentences. A (bird flu virus) may be detected in ducks.Logical formLearned from13 sentences. A female can be a duck.Logical formLearned from13 sentences. A duck can be silly.Logical formLearned from13 sentences. A zillion may back_up (flower photos) some (zillion shots) of ducks.Logical formLearned from13 sentences. A (companion duck) may pertain-to a person.Logical formLearned from13 sentences. A person may watch a (companion duck).Logical formLearned from13 sentences. A female can be a sitting duck.Logical formLearned from13 sentences.