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Once you've done that, I'd be interested to know the probabilities for:

A) A station appearing in all 6 rounds of a championship. (Could include probabilities of 1, 2, 3, 4 and 5 appearances whilst you're at it.)

B) All 90 stations in a championship being different.

The probability of a given station appearing in

6 rounds - 1 in 580465
5 rounds - 1 in 11895
4 rounds - 1 in 585
3 rounds - 1 in 54
2 rounds - 1 in 8.84
1 round - 1 in 2.72
0 rounds - 1 in 2.00

The chances of being no repeat stations are

2 rounds - 1 in 6.30
3 rounds - 1 in 325
4 rounds - 1 in 192320
5 rounds - 1 in 2.12 billion
6 rounds - 1 in 883 trillion