A friend may knock at a door.Logical formLearned from6 sentences. Some inches of water may knock a person off feet.Logical formLearned from6 sentences. A hand may knock.Logical formLearned from6 sentences. Energy may knock electrons.Logical formLearned from6 sentences. A male may knock a guy.Logical formLearned from6 sentences. Baggage may knock a male.Logical formLearned from6 sentences. A blow may knock a female.Logical formLearned from6 sentences. A company may be knocked offline.Logical formLearned from6 sentences. A mother may knock.Logical formLearned from6 sentences. Opportunity may knock a tv-network.Logical formLearned from6 sentences. A ring may knock a person.Logical formLearned from6 sentences. Best friends may knock on a door.Logical formLearned from6 sentences. A person may knock off a table.Logical formLearned from6 sentences. Boys may knock on a door.Logical formLearned from6 sentences. A time may knock.Logical formLearned from6 sentences.