preference swaps

Parties and independents have to often swap preferences. this has come up again with the libs rumoured to be considering preferencing labor in the nats safest seat Mallee (nat 24.8) this is really tricky because labor usually comes in the top two while winnig is doubtful in a very safe seat like mallee this results in a unusual situation. If the results are after the elimination of most minor candidates

Nats 46%
Lib 21%
Alp 20%
Grn 8%
Pup 5%
If palmer gives 80% of his preferences to the libs and 10% to nats and labor each.
Nats 46.5%
Lib 25%
Alp 20.5%
Grn 8%
Greens give 90% to labor and 5% to libs and nats.
Nats 46.5%
Alp 28.4%
Lib 25.1%
Libs preference labor 95% and nats 5%
Alp win 53-47 
Note this is approximate and you change the greens amount to anything less than labor and reduce the amount.

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