With no explanation, label each line with "O", "product-software", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
It
uses
a
version
of
the
LLVM
clang
compiler
.
It:O
uses:O
a:O
version:O
of:O
the:O
LLVM:product-software
clang:product-software
compiler:product-software
.:O