entrant constructor chassis engine tyre driver rounds
entrant
constructor
chassis
engine
tyre
driver
rounds
list length
list length
list length list_number list_number1 list_number2
text <d,text> <n, text> text text text <c, score>
scuderia ferrari spa sefac ferrari 156 ferrari 178 1.5 v6 d phil hill 1-3, 5-7
how many drivers drove all the rounds ?
WRB JJ NNS VBD PDT DT NNS .
8
select count ( c6 ) from w where c7 = 'all'