With no explanation, label each line with "product-airplane", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
It
was
re-equipped
with
Vickers
Valetta
transports
in
January
1951
and
these
were
replaced
by
Handley
Page
Hastings
four-engine
transport
aircraft
in
June
1957
.
It:O
was:O
re-equipped:O
with:O
Vickers:product-airplane
Valetta:product-airplane
transports:O
in:O
January:O
1951:O
and:O
these:O
were:O
replaced:O
by:O
Handley:product-airplane
Page:product-airplane
Hastings:product-airplane
four-engine:O
transport:O
aircraft:O
in:O
June:O
1957:O
.:O