once in a blue moon , listed under moon in L ) may be listed elsewhere (under blue moon in W).
( ( once ( in ( ( ( a ( blue moon ) ) , ) ( listed ( under ( ( moon ( in L ) ) -RRB- ) ) ) ) ) ) ( ( may ( be ( ( listed elsewhere ) ( -LRB- ( ( under ( ( blue moon ) ( in W ) ) ) -RRB- ) ) ) ) ) . ) )
(ROOT (S (NP (NP (RB once)) (PP (IN in) (NP (NP (DT a) (JJ blue) (NN moon)) (, ,) (VP (VBN listed) (PP (IN under) (NP (NP (NN moon)) (PP (IN in) (NP (NNP L))) (-RRB- -RRB-))))))) (VP (MD may) (VP (VB be) (VP (VBN listed) (ADVP (RB elsewhere)) (PRN (-LRB- -LRB-) (PP (IN under) (NP (NP (JJ blue) (NN moon)) (PP (IN in) (NP (NNP W))))) (-RRB- -RRB-))))) (. .)))
The phrase "once in a blue moon" may be listed in the F column.
( ( ( ( ( The phrase ) `` ) ( once ( in ( a ( blue moon ) ) ) ) ) '' ) ( ( may ( be ( listed ( in ( the ( F column ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN phrase)) (`` ``) (NP (NP (RB once)) (PP (IN in) (NP (DT a) (JJ blue) (NN moon)))) ('' '')) (VP (MD may) (VP (VB be) (VP (VBN listed) (PP (IN in) (NP (DT the) (NN F) (NN column)))))) (. .)))