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-))))) (. .)))
"Once in a blue moon" may not be listed anywhere other than the original place.
( `` ( ( Once ( in ( a ( blue moon ) ) ) ) ( '' ( ( ( may not ) ( be ( ( listed ( anywhere other ) ) ( than ( the ( original place ) ) ) ) ) ) . ) ) ) )
(ROOT (S (`` ``) (FRAG (ADVP (RB Once)) (PP (IN in) (NP (DT a) (JJ blue) (NN moon)))) ('' '') (VP (MD may) (RB not) (VP (VB be) (VP (VBN listed) (NP (RB anywhere) (JJ other)) (PP (IN than) (NP (DT the) (JJ original) (NN place)))))) (. .)))