An invitation may undergo requirements.Logical formLearned from15 sentences. A person may accept invitations.Logical formLearned from15 sentences. Invitation can be for bids.Logical formLearned from15 sentences. An invitation can be to a company.Logical formLearned from15 sentences. Invitations can be for a party.Logical formLearned from15 sentences. A man may take invitations.Logical formLearned from15 sentences. An invitation can be for a person.Logical formLearned from15 sentences. An invitation can be to debate.Logical formLearned from15 sentences. A US-president may extend an invitation.Logical formLearned from15 sentences. An invitation can be courteous.Logical formLearned from15 sentences. Invitations can be from leaders.Logical formLearned from15 sentences. An invitation can be spontaneous.Logical formLearned from15 sentences. An invitation can be for someone.Logical formLearned from15 sentences. An invitation can be to an opening.Logical formLearned from15 sentences. (Wedding invitations) can be beautiful.Logical formLearned from15 sentences.