With no explanation, label each line with "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport", "building-hospital" or "building-hotel" preceded by ":".
An
alternative
formulation
as
(
Cu+
)
3
(
S2−
)
(
S2
)
−
was
proposed
and
supported
by
calculations
.
An:O
alternative:O
formulation:O
as:O
(:O
Cu+:O
):O
3:O
(:O
S2−:O
):O
(:O
S2:O
):O
−:O
was:O
proposed:O
and:O
supported:O
by:O
calculations:O
.:O