Dave is not blue. Dave is green. Dave is quiet. Dave is round. Dave is young. Fiona is blue. Fiona is not green. Fiona is kind. Fiona is red. Fiona is round. All blue, red things are round. All red things are young. If something is quiet and red then it is not young. If something is quiet then it is kind. If something is not kind and not red then it is blue. If something is round and not kind then it is young. If something is red and not blue then it is round. If Dave is not blue then Dave is young.
Dave is red.