As the above clues demonstrate, a Graphic CE should be accompanied not only by a flag but also by a Semantic CE.
( ( As ( ( the ( above clues ) ) demonstrate ) ) ( , ( ( a ( Graphic CE ) ) ( ( should ( be ( accompanied ( ( not only ) ( ( ( by ( a flag ) ) ( but also ) ) ( by ( a ( Semantic CE ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN As) (S (NP (DT the) (JJ above) (NNS clues)) (VP (VBP demonstrate)))) (, ,) (NP (DT a) (NNP Graphic) (NNP CE)) (VP (MD should) (VP (VB be) (VP (VBN accompanied) (PP (CONJP (RB not) (JJ only)) (PP (IN by) (NP (DT a) (NN flag))) (CONJP (CC but) (RB also)) (PP (IN by) (NP (DT a) (NNP Semantic) (NNP CE))))))) (. .)))
A graphic CE should have a flag and Semantic CE with it. 
( ( A ( graphic CE ) ) ( ( should ( ( have ( ( ( a flag ) and ) ( Semantic CE ) ) ) ( with it ) ) ) . ) )
(ROOT (S (NP (DT A) (JJ graphic) (NN CE)) (VP (MD should) (VP (VB have) (NP (NP (DT a) (NN flag)) (CC and) (NP (NNP Semantic) (NNP CE))) (PP (IN with) (NP (PRP it))))) (. .)))