suppose bottom 4 teams have won least matches  and upper 4 teams have won
equal number of matches  ...

1 -> x
2 -> x
3 -> x
4 -> x

5 -> 6
6 -> 4
7 -> 2
8 -> 0

total matches are 56
and let upper four teams have won x matches each

so x = (56-(6+4+2+0))/4
 x = 11

so in this way to ensure qualification to semi finals team must win 11
matches  ...

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