class type ships displacement note
class
type
ships
displacement
note
list length
list length
number
list length
text <c,text> <n,text> unitnum <c,text>
rari class tug supply vessel a635 revi 1,450 tonnes ice-breaking capabilities to 2 meters level ice
how many of the classes are type salvage tug ?
WRB JJ IN DT NNS VBD-AUX NN NN NN .
2
select count ( c1 ) from w where c2 = 'salvage tug'