[word=to] [tag=VB] [tag=JJR] [word=□] □
[word=to] [tag=VB] [tag=JJR] [word=models] □
[word=to] [tag=VB] [tag=JJR] [word=to] □
" We need to build better models of physical effects , but then you have to abstract them at the synthesis level , " said Pileggi .