Concretely, one of the questions is
*
Alfred, Ben, Charlie, Dan and Edward are going to movies. Alfred must sit in the middle. Ben and Charlie are a couple. They must sit together.
Concretely, one of the questions is
*
Alfred, Ben, Charlie, Dan and Edward are going to movies. Alfred must sit in the middle. Ben and Charlie are a couple. They must sit together.
Kindly refer to this