Operation model

Operation modelOperation modelOperation modelOperation modelOperation modelOperation modelOperation modelOperation modelOperation modelOperation modelOperation modelOperation modelOperation modelOperation modelOperation modelOperation modelOperation modelOperation modelOperation modelOperation modelOperation modelOperation modelOperation modelOperation modelOperation modelOperation modelOperation modelOperation modelOperation modelOperation modelOperation modelOperation modelOperation modelOperation modelOperation modelOperation modelOperation modelOperation modelOperation modelOperation modelOperation modelOperation modelOperation modelOperation modelOperation modelOperation modelOperation modelOperation model